Upgrades to Ember 1.3.0 and Ember-Data 1.0-b5

WIP:
- Embedded records need to be properly tested.
- Test suite is no longer valid. Tests need to be rewritten
Adds contributors and license
Link to contributor profiles
Updates contributors
Starting to update tests. Added @pedrokiefer tests

Many failing need to be fixed
Embedded relationships are declared in attrs
Fixes support for embedded with extractSingle
Fixes embedded objects with extractArray
Deletes pre-1.0 methods
Tests for embedded records are now in the serializer