Reset isSaving to false when the record is not dirty.

Since saving is a noop when the record is not dirty, we don't actually call the adapter's saveRecord (or createRecord) method. Because of this, nothing ever resets the isSaving state back to false when it's "done".
Add Model#reload
Don't convert null to object when fetching attr

typeof(null) returns "object" in javascript, which was incorrectly
causing attr to call Ember.create(null)
Ensure that adapter callbacks' context is always adapter
Merge pull request #52 from drogus/dont-convert-null-to-object

Don't convert null to object when fetching attr
Merge pull request #51 from drogus/adapter-callbacks-context

Ensure that adapter callbacks' context is always adapter
Merge pull request #54 from eventualbuddha/reset-is-saving-on-non-dirty-save

Reset isSaving to false when the record is not dirty.
Make findQuery actually use params

The current `_ajax` function on the RESTAdapter doesn't use
passed-in params if the request is not a GET.

This pull request uses JQuerys `param` function to urlencode
the params object (in the case of a GET request). For other
HTTP verbs, the behavior stays the same.
Merge pull request #55 from satchmorun/fix-for-findQuery

Make findQuery actually use params
Refactor: s/self.fn.call(self, ...)/self.call(...)/
Merge pull request #56 from satchmorun/refactor-self-invocations

Refactor: s/self.fn.call(self, ...)/self.call(...)/
Should respect rootKey from create response as well as when finding
Merge pull request #58 from alexspeller/use-rootKey-when-creating

Should respect rootKey from create response as well as when finding
Make #58 actually work and fix tests
Merge pull request #59 from alexspeller/oops

Make #58 actually work and fix tests
Initial implementation of camelization support
Add test for writing
Merge pull request #60 from alexspeller/support-camelization

Initial implementation of camelization support
Support objects with no ID
Merge pull request #61 from alexspeller/support-objects-with-no-id

Support objects with no ID