feat(docs): add ability to submit PRs for docs

* Add feature to release script that will publish new docs to the Wiki on each release
* Add documentation directory to the repo so that contributors can update the Wiki as necessary

>  Many thanks to the Angular CLI team for developing the code we are using! 👍

Fixes #550, #520.

Author: CaerusKaru

docs/design/grid-layout.md

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+
+## JavaScript API (Imperative)
+
+Most of the **@angular/flex-layout** functionality is provided via Directives used **declaratively** in template HTML. There are three (3) programmatic features, however, that are published for programmatic usages:
+
+* **[ObservableMedia](https://github.com/angular/flex-layout/wiki/ObservableMedia)**: <br/> Injectable Observable used to subscribe to MediaQuery activation changes.<br/>
+`constructor(public media:ObservableMedia ) { ... }`
+
+* **[BREAKPOINTS](https://github.com/angular/flex-layout/wiki/BreakPoints)**: <br/> Opaque token used to override or extend the default breakpoints with custom MediaQuery breakpoints.<br/> `providers: [{provide: BREAKPOINTS, useValue: MY_CUSTOM_BREAKPOINTS }]`
+
+* **[BaseFxDirectiveAdapter](https://github.com/angular/flex-layout/wiki/BaseFxDirectiveAdapter)**: <br/> Adapter class useful to extend existing Directives with MediaQuery activation features. <br/> `export class ClassDirective extends NgClass { ... }` 
+
+<br/>
+
+## HTML API (Declarative)
+
+The features of Flex-Layout are best used, however, declaratively in template HTML. This API has two (2) significant feature sets:
+
+*  **[Static API](https://github.com/angular/flex-layout/wiki/Declarative-API-Overview)**: Summary of static API features.<br/>
+*  **[Responsive API](https://github.com/angular/flex-layout/wiki/Responsive-API)**: Introducing Responsive API and BreakPoints details.<br/>
+
+As each directive (aka API) within **@angular/flex-layout** has its own constraints and options, the links below should be used to navigate to the specific the documentation pages for each directive.
+
+<br/>
+
+### Containers
+
+This API set applies flexbox CSS stylings for DOM **container elements** with 1 or more nested flex children:
+
+* [**fxLayout**](https://github.com/angular/flex-layout/wiki/fxLayout-API): <br/>Defines the flow order of child items within a flexbox container.<br/>`<div fxLayout="row" fxLayout.xs="column">  </div>`<br/>&nbsp;
+* **[fxLayoutWrap](https://github.com/angular/flex-layout/wiki/fxLayoutWrap-API)**  : <br/>Defines if child items appear on a single line or on multiple lines within a flexbox container.<br/>`<div fxLayoutWrap> </div>`<br/>&nbsp;
+* **[fxLayoutGap](https://github.com/angular/flex-layout/wiki/fxLayoutGap-API)**:<br/>Defines if child items within a flexbox container should have a gap. <br/>`<div fxLayoutGap="10px">  </div>`<br/>&nbsp;
+* **[fxLayoutAlign](https://github.com/angular/flex-layout/wiki/fxLayoutAlign-API)**:<br/>Defines how flexbox items are aligned according to both the main-axis and the cross-axis, within a flexbox container. <br/>`<div fxLayoutAlign="start stretch">  </div>`
+
+
+<br/>
+
+### Child Elements within Containers
+
+This API set applies flexbox CSS stylings for a DOM element nested within FlexBox DOM container:
+
+* **[fxFlex](https://github.com/angular/flex-layout/wiki/fxFlex-API)**: <br/>This markup specifies the resizing of its host element within a flexbox container flow.<br/>`<div fxFlex="1 2 calc(15em + 20px)"></div>`
+
+* **[fxFlexOrder](https://github.com/angular/flex-layout/wiki/fxFlexOrder-API)**: <br/>Defines the order of a flexbox item. <br/>`<div fxFlexOrder="2"></div>`
+
+* **[fxFlexOffset](https://github.com/angular/flex-layout/wiki/fxFlexOffset-API)**: <br/>Offset a flexbox item in its parent container flow layout. <br/>`<div fxFlexOffset="20px"></div>`
+
+* **[fxFlexAlign](https://github.com/angular/flex-layout/wiki/fxFlexAlign-API)**: <br/>Works like fxLayoutAlign, but applies only to a single flexbox item, instead of all of them. <br/>`<div fxFlexAlign="center"></div>`
+
+* **[fxFlexFill](https://github.com/angular/flex-layout/wiki/fxFlexFill-API)**: <br/> Maximizes width and height of element in a layout container <br/>`<div fxFlexFill></div>`
+
+
+<br/>
+
+### Special Responsive Features
+
+While the following APIs also add or remove DOM element inline styles, they are NOT FlexBox CSS specific. 
+
+Instead these are **Responsive** APIs used to adjust specific, non-flexbox styles when a specific mediaQuery has activated:
+
+* **[fxShow](https://github.com/angular/flex-layout/wiki/fxShow-API)**: <br/>This markup specifies if its host element should be displayed (or not).<br/>`<div fxShow [fxShow.xs]="isVisibleOnMobile()"></div>`
+
+* **[fxHide](https://github.com/angular/flex-layout/wiki/fxHide-API)**: <br/>This markup specifies if its host element should NOT be displayed.<br/>`<div fxHide [fxHide.gt-sm]="isVisibleOnDesktop()"></div>`
+
+
+* **[ngClass](https://github.com/angular/flex-layout/wiki/ngClass-API)** :
+<br/>Enhances the **ngClass** directives with class changes based on mediaQuery activations. <br/>`<div [ngClass.sm]="{'fxClass-sm': hasStyle}"></div>`. 
+
+* **[ngStyle](https://github.com/angular/flex-layout/wiki/ngStyle-API)**: 
+<br/>Enhances the **ngStyle** directive with style updates based on mediaQuery activations. <br/>`<div [ngStyle.xs]="{'font-size.px': 10, color: 'blue'}"></div>`
+
+

docs/design/ssr-gen.md

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+Several Angular Material 1 applications: **[Material-Adaptive](https://github.com/angular/material-adaptive/tree/master/shrine)** have been implemented using custom Flexbox CSS. These efforts illustrated the needs and features within a responsive, adaptive application.
+
+*  [Pesto](https://material-adaptive.firebaseapp.com/pesto/app/dist.html#/home)
+*  [Shring](https://material-adaptive.firebaseapp.com/shrine/app/dist.html)
+
+![screen shot 2016-11-05 at 7 26 56 am](https://cloud.githubusercontent.com/assets/210413/20029970/44c16d64-a329-11e6-9a9a-bd00561ea936.png)
+
+Different from responsive layouts where components change sizes and positions, the concepts of Adaptive layouts 
+provide for UX where  **different components** may be used for different breakpoints. 
+
+Animations can also be extended to support MediaQuery activations: different animations will run for different viewport sizes.
+
+Developers can use the following directives to achieve some Adaptive UX goals:
+
+*  `fxHide`
+*  `fxShow`
+*  `ngIf`
+
+For examples of `fx-hide` usages in Adaptive layouts, please review the demo **Show & Hide Directives**:
+
+* [Demo](https://tburleson-layouts-demos.firebaseapp.com/#/responsive)
+* [Source](https://github.com/angular/flex-layout/blob/master/src/demo-app/app/docs-layout-responsive/responsiveShowHide.demo.ts#L15) 
+
+---- 
+
+#### Core Directives + Responsive Features
+
+Responsive features for core Angular directives:
+
+*  `[ngStyle.<alias>]=""`  
+*  `[ngClass.<alias>]=""` 
+*  `*ngIf.<breakpoint alias>=""` is not yet supported. 
+
+Here is the current solution solution to enabled responsive/adaptive features with **`*ngIf`**:
+
+```js
+import {ObservableMedia} from '@angular/flex-layout';
+
+@Component({
+  selector : 'my-mobile-component',
+  template : `
+      <div *ngIf="media.isActive('xs')">
+         This content is only shown on Mobile devices
+      </div>
+      <footer>
+         Current state: {{ }}
+      </footer>
+  `
+})
+export class MyMobileComponent {
+  public state = '';
+  constructor(public media:ObservableMedia ) {
+    media.asObservable()
+      .subscribe((change:MediaChange) => {
+        this.state = change ? `'${change.mqAlias}' = (${change.mediaQuery})` : ""
+      });
+  }
+}
+```

docs/documentation/API-Documentation.md

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+The [Google JavaScript Style Guide](https://google.github.io/styleguide/jsguide.html) is the
+basis for our coding style, with additional guidance here where that style guide is not aligned with
+ES6 or TypeScript.
+
+## Coding practices
+
+### General
+
+#### Write useful comments
+Comments that explain what some block of code does are nice; they can tell you something in less time than it would take to follow through the code itself.
+
+Comments that explain why some block of code exists at all, or does something the way it does, 
+are _invaluable_. The "why" is difficult, or sometimes impossible, to track down without seeking out 
+the original author. When collaborators are in the same room, this hurts productivity. 
+When collaborators are in different timezones, this can be devastating to productivity.
+
+For example, this is a not-very-useful comment:
+```ts
+// Set default tabindex.
+if (!$attrs['tabindex']) {
+  $element.attr('tabindex', '-1');
+}
+```
+
+While this is much more useful:
+```ts
+// Unless the user specifies so, the calendar should not be a tab stop.
+// This is necessary because ngAria might add a tabindex to anything with an ng-model
+// (based on whether or not the user has turned that particular feature on/off).
+if (!$attrs['tabindex']) {
+  $element.attr('tabindex', '-1');
+}
+```
+
+#### Prefer more focused, granular components vs. complex, configurable components.
+
+For example, rather than doing this:
+```html
+<md-button>Basic button</md-button>
+<md-button class="md-fab">FAB</md-button>
+<md-button class="md-icon-button">pony</md-button>
+```
+
+do this:
+```html
+<md-button>Basic button</md-button>
+<md-fab>FAB</md-fab>
+<md-icon-button>pony</md-icon-button>
+```
+
+#### Prefer small, focused modules
+Keeping modules to a single responsibility makes the code easier to test, consume, and maintain. 
+ES6 modules offer a straightforward way to organize code into logical, granular units. 
+Ideally, individual files are 200 - 300 lines of code.
+
+#### Less is more
+Once a feature is released, it never goes away. We should avoid adding features that don't offer 
+high user value for price we pay both in maintenance, complexity, and payload size. When in doubt, 
+leave it out. 
+
+This applies especially so to providing two different APIs to accomplish the same thing. Always 
+prefer sticking to a _single_ API for accomplishing something. 
+
+### TypeScript
+
+#### Provide function descriptions
+For functions that are more complicated than a simple getter/setter, provide at least a brief 
+sentence explaining what the function does and/or _why_ it does something.
+

docs/documentation/Adaptive-Layouts.md

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+### Background
+
+The primary idea behind the flexbox layout is to give HTML DOM elements the ability to alter their width/height (and order) to best fill the available space... to *reflow* and *layout* for different kinds of display devices and different screen sizes. 
+
+More importantly, flexbox css is direction-agnostic as opposed to the regular layouts (block which is vertically-based and inline which is horizontally-based). While those work well for some pages, they lack flexibility to support large or complex applications: especially when it comes to orientation changing, resizing, stretching, shrinking, etc.  Especially important are *flex* features that resize elements to intelligently fill available spaces. A flex container expands items to fill available free space, or shrinks them to prevent overflow.
+
+Now let's add these complexities the requirements that developers often want combine the CSS Flexbox API with CSS media queries in order to support responsive layouts. e.g.
+
+
+<a href="" target="_blank">
+<img src="https://cloud.githubusercontent.com/assets/210413/20029960/fbbc0e62-a328-11e6-8045-c6532affc857.png">
+</a>
+
+<br/>
+
+Unfortunately, developers manually implementing Flexbox CSS must become experts at both the syntax and the workarounds to accommodate browser-specific differences in Flexbox runtime support.
+
+Several Angular Material 1 applications: **[Material-Adaptive](https://github.com/angular/material-adaptive/tree/master/shrine)** have been implemented using custom Flexbox CSS. These efforts illustrated the needs and features within a responsive, adaptive application.
+
+*  [Pesto](https://material-adaptive.firebaseapp.com/pesto/app/dist.html#/home)
+*  [Shring](https://material-adaptive.firebaseapp.com/shrine/app/dist.html)
+
+![screen shot 2016-11-05 at 7 26 56 am](https://cloud.githubusercontent.com/assets/210413/20029970/44c16d64-a329-11e6-9a9a-bd00561ea936.png)
+
+These additional feature ideas - derived from real-world Application implementations - have now been implemented within the Angular Flex-Layout library. Here are some of this libraries more notable features:   
+
+*  Direct DOM element CSS style injections
+*  Distinct responsive engine (MediaQuery change notifications with adapters)
+*  Subscription process for adaptive notifications to trigger custom Layout processes
+

docs/documentation/Angular-Flex-Layout-Coding-Standards.md

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+The token **BREAKPOINTS** is an opaque token in **@angular/flex-layout** that is used to build a **Provider** for a raw list of breakpoints.
+
+```js
+import {OpaqueToken} from '@angular/core';
+
+export const BreakPointsProvider = { 
+  provide: BREAKPOINTS,
+  useValue: DEFAULT_BREAKPOINTS
+};
+```
+
+```js
+@NgModule({
+  providers: [
+    BreakPointsProvider,     // Supports developer overrides of list of known breakpoints
+ // BreakPointRegistry,      // Registry of known/used BreakPoint(s)
+ // MatchMedia,              // Low-level service to publish observables w/ window.matchMedia()
+ // MediaMonitor,            // MediaQuery monitor service observes all known breakpoints
+ // ObservableMediaProvider  // easy subscription injectable `media$` matchMedia observable
+  ]
+})
+export class MediaQueriesModule {
+}
+```
+
+This provider is used to return a list to ALL known BreakPoint(s)... and, in turn, this list is used internally to register mediaQueries and announce mediaQuery activations.
+
+
+### Custom BreakPoints
+
+Using the **BREAKPOINTS** OpaqueToken, developers can add custom breakpoints or easily override existing breakpoints. 
+
+For example to add mediaQueries that activate when printing:
+
+##### - `custom-breakpoints.ts` - 
+
+```js
+import {DEFAULT_BREAKPOINTS} from '@angular/flex-layout';
+
+const PRINT_BREAKPOINTS = [{
+  alias: 'xs.print',
+  suffix: 'XsPrint',
+  mediaQuery: 'print and (max-width: 297px)',
+  overlapping: false
+}];
+
+export const CustomBreakPointsProvider = { 
+  provide: BREAKPOINTS,
+  useValue: [...DEFAULT_BREAKPOINTS,...PRINT_BREAKPOINTS];
+};
+```
+
+##### - `my-app-module.ts` -
+
+```js
+import { CustomBreakPointsProvider } from 'custom-breakpoints.ts';
+
+@NgModule({
+  imports : [
+    CommonModule,
+    FlexLayoutModule,
+  ]
+  providers: [
+    CustomBreakPointsProvider,     // Adds breakpoints for 'print' mediaQueries
+  ]
+})
+export class MyAppModule {
+}
+```
+
+With the above changes, when printing on mobile-sized viewports the **`xs.print`** mediaQuery will activate.
+
+### Custom Breakpoints and Directives
+
+It must be noted that simply registering custom breakpoints will not automatically mean that Flex-Layout API will support those as selectors. 
+
+In the above example the custom Breakpoint has been registered, but HTML selectors for **`xs.print`** will not work automatically.  Consider the scenario below where some content should be hidden while printing and other content has different layouts while printing:
+
+```html
+<section 
+    class="main" 
+    fxShow 
+    fxHide.xs.print="true"> 
+ ... 
+</section>
+
+<footer 
+    fxLayout="row" 
+    fxLayout.xs.print="column"> 
+ ... 
+</section>
+```
+
+> Notice the use of 'xs.print' alias in the selectors above ^.
+
+To enable these custom, **responsive selectors**, developers must **extend** the `ShowHideDirective` and the `LayoutDirective`.
+
+e.g.
+
+```js
+import { ShowHideDirective, negativeOf } from '@angular/flex-layout';
+
+@Directive({selector: `
+  [fxHide.xs.print]
+`})
+export class CustomShowHideDirective extends ShowHideDirective {
+  constructor(monitor: MediaMonitor, elRef: ElementRef, renderer: Renderer) {
+    super(monitor, elRef, renderer);
+  }
+
+  @Input('fxHide.xs.print')    set hideXs(val) {
+    this._cacheInput("showXsPrint", negativeOf(val));
+  }
+}
+```

docs/documentation/Background.md

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+<a href="http://caniuse.com/#feat=flexbox" target="_blank">
+<img src="https://cloud.githubusercontent.com/assets/210413/21288118/917e3faa-c440-11e6-9b08-28aff590c7ae.png">
+</a>
+

docs/documentation/BreakPoints.md

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+Below are the team standards for Flex-Layout Code reviews:
+
+* Before any coding begins on new, large, or breaking work, a design discussion should take place.
+* All code changes require a review and approval.
+* All behaviors should be covered by unit tests in the same PR.
+* Large changes should be accompanied by corresponding e2e tests in the same PR. 
+* Authors should attempt to keep PRs to 200 - 300 line changes.
+ 
+## Workflow
+1. The code author sends a PR for review. This request should include:
+  * A mention of the intended reviewer(s) (e.g., `@thomasburleson`)
+  * A high-level description of the change being made.
+  * Links to any relevant issues.
+  * Screenshots (for visual changes or new additions)
+2. Reviews provide comments and the author responds / makes changes. Repeat until LGTM.
+3. One or more of the reviewers applies the "LGTM" label.
+4. The party responsible for merging PRs will do so.