Specify additional headers for RESTAdapter.
Declared ajaxHeaders.
Allowing inverse relationships to be nullable.

Now we can prevent `DS.Model.inverseFor` from automatically looking for
a relationship and identifying the wrong relationship in some cases
Don't assign DS to window unless window exists - Fixes #681
Merge pull request #1068 from dblock/ajax-headers

Specify additional headers for DS.RESTAdapter.
Added DS.DebugAdapter which extends Ember.DataAdapter
Merge pull request #1114 from teddyzeenny/extension

Added DS.DebugAdapter which extends Ember.DataAdapter
Merge pull request #1109 from rzurad/null-inverse-relationship

Allowing inverse relationships to be nullable.
Require application.Store to be defined - Fixes #1084
mixup asset file
bump ember - 1.0.0-rc.7
check key and plural match in _pluarlizeAliases