Added forum contributions statistics backend
Added frontend stubs for stats
Merge branch 'develop' of https://github.com/Solerni-R1-1/CoreBundle into feature/stats
Fix wrong override of allowed special characters in last name in registration form
Revert "Fix wrong override of allowed special characters in last name in registration form"

This reverts commit 6a6beb5860b13785fca743eaf17f0b5779fa5832.
Prepared method for stat about knowledge badges
Statistics now contains badges success
Merge branch 'develop' of https://github.com/Solerni-R1-1/CoreBundle into feature/stats
Added some comments
Refactored badges statistics...
Merge branch 'develop' of https://github.com/Solerni-R1-1/CoreBundle into feature/stats
Finished base statistics
Added export of knowledge badges
Merge branch 'feature/stats' into develop
Merge branch 'develop' of https://github.com/Solerni-R1-1/CoreBundle into develop