smartling 7.x-2.2

Features:
- node utils
- entity urils
- major UI improvements:
* merged 2 views of smartling submissions into 1 tab
* added filters to submissions views
* added use of VBO instead of a "download" link per submission
* checks whether user is working with translation from a default sites language
- major refactoring: rebuilt main parts of the module into the OOP style. + much better integration with DI container
- new fields settings storage that smoothly supports any entity type. Not only predefined ones.
- presented hook_smartling_data_processor_info()
- Added ability to add/modify field/entity processors from third-party modules
- Added a title field to the smartling entity
- New "pseudo local " mode for translation

Fixes:
- Fixed url/images/text rewrites in order to be able to modify translated content before it is applied
- fixed some tests
- Fixed the progress formula when checking the file status
- Refactoring: made push callback use the same code base as the other parts of the module.
- fixed the missing dependency for demo_content module