Merge pull request #23 from chives/dev-trasnlatable

Added TranslatableRepository class with createTranslatableQueryBuilder h...
Merge pull request #24 from chives/dev-trasnlatable

Updated Translatable docs
Merge pull request #25 from chives/dev-trasnlatable

Updated main readme.md
Merge pull request #26 from chives/dev-trasnlatable

TranslatableListener now frees its internal objects during onClear()
Merge pull request #27 from chives/dev-trasnlatable

Added test for internal property observers in TranslatableListener
Fixed accidentally overwriting of translations created by getTranslation()