full list of changes below:

- fixed ModelCriteria::clear()
- added ModelCriteria::clear() tests
- refactored query object create()
- added, removed or updated bunch of phpDocs
reduced ModelCriteria::clear() tests
make ModelCriteria::create() changes more backward compatible
Merge pull request #653 from alanbem/hotfix/query_object_reset

Can't fully reset query objects.