Remove excess spacing from the end of lines etc.

Move class properties out of `Object.defineProperty` calls to class getters and setters. This allows us to target them with esdoc annotations in a way that wasn't possible before with `Object.defineProperty`

Ref joshmarinacci#32

- Remove `/** @ignore*/` before each dependency require - unfortunately this will make the documentation coverage score go down, but it seems better to have easier to read code
- Assign dependencies with `const` instead of `var` since it prevents accidental re-assignment
- Sort dependencies alphabetically

Add `@ignore` to unimplemented methods to hide them from the documentation

Ref joshmarinacci#32

- Hide private methods and properties
- Add `esdoc-member-plugin` to document ES6 class getters and setters

Ref joshmarinacci#32

- Update documentation for line related functions to provide examples on how they can be called
- Also remove `makeLine()` function since it is now obsolete

Ref joshmarinacci#32

Update `Context` to more closely match the documentation on MDN, since it is intended to match the API available from the HTML5 `<canvas>` API. In each case - a link has been provided to the appropriate MDN page, both for attribution and for further reference.

Ref joshmarinacci#32

Provide documentation for additional methods(in particular those not available on MDN for reference) to better explain their purpose and usage. Whilst some of these methods may be private and/or non-exported - this information may still prove useful for library contributors and maintainers(some IDEs can provide this information in a popup dialog box).

Also, make more usage of `{@link }` to link to other classes, functions, variables etc. when talking about them in the docblocks

Ref joshmarinacci#32

- Align `=` signs to make the assignments easier to read
- Replace single-line `if` statements to wrap `return` in braces so it's easier to read at a glance
- Remove commented out `console.log` logging/debugging code

Fix small documentation bugs(missing asterisks etc.) causing impoper formatting of documentation

Ref joshmarinacci#32

Add missing docblocks for `start` and `end` attribues of `Line`

Ref joshmarinacci#32

Provide more detailed documentation on the Bitmap class

Ref joshmarinacci#32

Add `@ignore` tag to methods that are not part of the canvas API spec

Ref joshmarinacci#32

Update function docblocks to correctly reflect the fact that resolved
promises resolve to `void`

Ref joshmarinacci#32