Merge pull request #10 from stanislavprokopov/master

Fix block rendering
Changed the way of setting default labels of choises for isNull comparison form
Tweaked translations naming and service naming conventions
Merge pull request #11 from chives/dev

Changed the way of setting default labels of choices for isNull comparison form
Added default value for 'form_translation_domain' in FormFieldExtension
Merge pull request #12 from chives/dev

Added default value for 'form_translation_domain' in FormFieldExtension
Unified php files' docblocks
Merge pull request #13 from chives/dev

Unified php files' docblocks