Added forum contributions statistics backend
Added frontend stubs for stats
Added blog to mooc
Migration db for adding blog to mooc
Fixed tab for blog in workspace
Merge branch 'feature/blog' into develop
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
Fix override in special characters allowed for the last name in the registration form
Statistics now contains badges success
Started badge refactoring
Finalized badges refactoring
Merge branch 'release/candidate' of https://github.com/Solerni-R1-1/CoreBundle into develop
Merge branch 'develop' of https://github.com/Solerni-R1-1/CoreBundle into feature/stats
Added some comments
Refactored badges statistics...
Exported badge common methods in BadgeManager service
Merge branch 'develop' of https://github.com/Solerni-R1-1/CoreBundle into feature/stats
Minor CSS fix