Bug fixes and HTTP interceptor
- Added HttpInterceptor service
- Added underscore to bower dependencies
- Fixed JSHint configuration
- Added REST web service link to README.md
- Main controller now loads the collection from the web service
- Main controller now saves new todos on $scope.addTodo()
- SingleTodo controller now saves the model on $scope.saveSummary()
- Fixed order of arguments for sync() and setID() in BaseModel factory
- Updated end point in TodoModel factory to make sure it's intercepted by HttpInterceptor service