Add File constraint
Move constraint to array
Merge pull request #37 from Wasper/wasper

Add File constraint to fsi_file field
Image type
CS
Update doc
Merge pull request #38 from Wasper/image

Image type
Added TranslatableParamConverter
Use locale from request to find entities in ParamConverter
Added LocaleListener passing locale from request to TranslatableListener
Updated docs
Removed useless validation