Fix special quest group members limit.
PEP8 misc
Fix error messages when accepting group invites
Add API endpoint for category tags. #520
Tell about updating pip packages in case of migration issues
Add missing comma in README
Replace . (dot) command with source in README
Merge pull request #522 from razvand/readme-update

README updates
Display available tags in new q form. #520
Add unit test for Blind spell
Save tags in new q. #520
Save only existing tags. #520
Merge pull request #520 from rosedu/520-question-add-tags

Choose tags when adding question
Merge pull request #523 from badescunicu/master

Add unit test for Blind spell
Single version of jquery.
New activity monitor start. #525
Update cpanel sidebar. #525
Filtering via GET params. #525
Add filtering in UI. #525
Allow a privileged user to remove endorsement from a question