Avatar refactoring
Minor improvements on avatar/gravatar settings.
Updating default avatar image
Merge branch 'avatar-refactor'
Minor fixes on sample data related to attachments model changes.
Taiga-events integration (realtime taiga)
Merge pull request #76 from taigaio/events-improvements

Taiga-events integration (realtime taiga)
Changed default events queue to postgresql queue
Fix unclear message on requirements.txt.
Minor changes on readme.
:poop: -> :toilet:
US #954: Task #1115: Create feedback endpoint
WIP