Extract backbone_rails_fixtures gem
Rename some files
Port fixtures_spec from Chorus and get it running.

- Add backbone, jquery and underscore
- Create user and test json fixtures
- setup jasmine
Add gitignore
Rename 'backbone_rails_fixtures' to 'backbone_fixtures_rails' and 'rspecFixtures' to 'backboneFixtures'
remove javascript dependencies from repo
Throw an error if jQuery or underscore are not defined