Unwrap MainCtrl from scope.
Use  in testing 'delete' action
Use mock  in 'createTodo' action
Test 'createTodo' more thoroughly
Test . blocks
Add tests for 'editTodo' method
Test 'cancelEditing' and 'deleteTodo'
Remove unnecessary returns
Fix: replace ng-change with ng-click for the checkboxes
Properly test .toggleCompleted
Test .updateTodo
Prepare for deployment