Allow pluralization to be configurable.

To customize provide a `pluralizedTypes` object to your extended
version of the Resolver:

```javascript
import Resolver from 'ember/resolver';

export default Resolver.extend({
  pluralizedTypes: {
   'sheep': 'sheep'
   'config': 'config'
  }
})
```
Update dist/.
Merge pull request #68 from rwjblue/pluralization

Allow pluralization to be configurable.
Allow namespace resolving

Will allow namespaces to be targeted for resolving:

`other@adapter:post` resolves to `other/adapters/post`

This is different than the Custom Type Prefixes in
https://github.com/stefanpenner/ember-resolver/pull/16 as that feature
only allows one chance to access the module. But if you want to have a
default module path and if that fails lookup a similar path in another
prefix the Custom Type Prefixes won't work and you must target the
namespaces specifically in the resolving path.