Update serialize documentation to reflect improved default behavior
Warn when the router encounters a url it cannot handle.
Add Ember.PromiseProxyMixin

A low level primitive for using ObjectProxy, ObjectController
and ArrayController's with promises.
Merge branch 'pr/3247' - Resolves #3247
Merge branch 'pr/3245' - Resolves #3245
Merge pull request #3084 from stefanpenner/promise_proxy

Add Ember.PromiseProxyMixin
resolve conflicts