Fix for Achievements
Fix special quest group members limit.
PEP8 misc
Fix error messages when accepting group invites
Merge pull request #519 from iulianR/special_quest

Fix special quest members limit
Use unittest.skip decorator for skipping tests
Merge pull request #532 from Gabriel59/issues

Remove pointless recursive call
Add glyphicon for 'Add player' button in Status page
Add bootstrap class for 'Submit' button in Add Player page
Add glyphicons for import/export/delete buttons in Questions page
Rename 'remove all' button into 'delete all' in Questions page
Change breadcrumb name from 'Questions pool' to 'Questions'
Add breadcrumbs for 'SpecialQuest > Manage Player' page
Fix breadcrumbs in Groups page
Add titles for links in Groups page
Add breadcrumbs for 'Groups > Message' page
Change table formular in 'Groups > Message' page
Fix breadcrumbs name in 'Edit Formula' page
Rename button to 'Go to Questions' in 'Workshop > Schedule' page
Change table formular in 'SpecialQuest > Add/Edit task' page