List activity per user and Desk

Added desk field to activity resource; on each item change
the desk the item belongs to is set to the activity that
is generated.
List activity per user and Desk

Wrote behave tests
chore(docker): use vanilla ubuntu distutils and pip; add png/webp/tiff to Pillow
Merge pull request #388 from actionless/dockerfile-fix-deps

chore(docker): use vanilla ubuntu distutils and pip; add png/webp/tiff to Pillow
List activity per user and Desk

Added name field to activity
SD-1100 : Problem with display_name
Merge pull request #392 from ioanpocol/master

SD-1100 : Problem with display_name
Merge pull request #387 from mugurrus/master

SD-1048 List activity per user and Desk
Merge remote-tracking branch 'siva/master'