Improved AJAX mocking in tests
Fixed issue with array observers that got fired multiple times when the following happened:
- .filter
- .find
- .find server request responds first
- .filter server request responds last
Merge branch 'master' into adapter-feature

* master:
  Fixed issue with array observers that got fired multiple times when the following happened: - .filter - .find - .find server request responds first - .filter server request responds last
  Improved AJAX mocking in tests