Update custom config info.

`config.ember.appkit` does not longer exist.
Merge pull request #137 from abuiles/patch-1

Update custom config info.
Ember Data adapters will resolve under config prefix

Breaking commit for pending PR
Don't change original resolver.js file

Only reopen to monkey patch
Merge pull request #138 from dockyard/bc-adapter-uses-config-prefix

Ember Data adapters will resolve under config prefix
Move adapter under config//adapters and let the resolver resolve
adapter.

Removes the need of having window.App defined for specifing an
adapter, now it will be resolved by the resolver. Will also facilitate
things for adding tests with QUnit.
Merge pull request #136 from abuiles/app-adapters

Move default adapter under app/adapters and let resolver resolve the adapter