[docs] Map is now required (#400)

* es6 map & small typo

* map is now required

* no need to call it es6 ...

README.md

@@ -82,6 +82,7 @@ compilation options in your `tsconfig.json` file.
 InversifyJS requires a modern JavaScript engine with support for:
 
 - [Reflect metadata](https://github.com/rbuckton/ReflectDecorators/blob/master/spec/metadata.md)
+- [Map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map)
 - [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) (Only required if using [provider injection](https://github.com/inversify/InversifyJS#injecting-a-provider-asynchronous-factory))
 - [Proxy](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy) (Only required if using [activation handlers](https://github.com/inversify/InversifyJS/blob/master/wiki/activation_handler.md))
 

wiki/environment.md

@@ -2,14 +2,15 @@
 
 InversifyJS requires a modern JavaScript engine with support for the 
 [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), 
+[Map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map),
 [Metadata Reflection API](http://rbuckton.github.io/ReflectDecorators/#reflect) and 
 [Proxy](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy) objects. 
-If your environment don't support one of these you will need to import a shim or polypill.
+If your environment don't support one of these you will need to import a shim or polyfill.
 
 ## Metadata Reflection API
 > :warning: **The `reflect-metadata` polyfill should be imported only once in your entire application** because the Reflect object is mean to be a global singleton. More details about this can be found [here](https://github.com/inversify/InversifyJS/issues/262#issuecomment-227593844).
 
-Required always. Use [reflect-metadata](https://www.npmjs.com/package/reflect-metadata) as polypill.
+Required always. Use [reflect-metadata](https://www.npmjs.com/package/reflect-metadata) as polyfill.
 
 ```
 $ npm install reflect-metadata
@@ -36,13 +37,18 @@ If you are working in a web browser you can use a script tag:
 
 This will create the Reflect object as a global.
 
+## Map
+[Maps](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map) are required when using InversifyJS 3 or higher.
+
+Most modern JavaScript engines support map but if you need to support old browsers you will need to use a map polyfill (e.g. [es6-map](https://www.npmjs.com/package/es6-map)).
+
 ## Promise
-Promises are only required only if you use want to 
+[Promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) are only required only if you use want to 
 [inject a provider](https://github.com/inversify/InversifyJS#injecting-a-provider-asynchronous-factory).
 
 Most modern JavaScript engines support promises but if you need to support old browsers you will need to use a promise polyfill (e.g. [es6-promise](https://github.com/stefanpenner/es6-promise) or [bluebird](https://www.npmjs.com/package/bluebird)).
 
 ## Proxy
-ES6 proxies are only required only if you want to [inject a proxy](https://github.com/inversify/InversifyJS/blob/master/wiki/activation_handler.md). 
+[Proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy) are only required only if you want to [inject a proxy](https://github.com/inversify/InversifyJS/blob/master/wiki/activation_handler.md). 
 
 As today (September 2016) proxies are not very well supported and it is very likely that you will need to use a proxy polyfill. For example, we use [harmony-proxy](https://www.npmjs.com/package/harmony-proxy) as polyfill to run our unit tests.