Delegates User.active update to True on first update

App flow changes in signup view require active flag True setting on first update
Merge pull request #71 from techiev2/users

Delegates User.active update to True on first update
Adds functionality to remove avatar image with empty string in payload
Changes database name
Merge pull request #72 from techiev2/users

Adds functionality to remove avatar image with empty string in payload
Fixes key for events json response
Fixes min_length issue with device generated taskId field
Merge pull request #73 from techiev2/tasks

Fixes min_length issue with device generated taskId field
Merge pull request #74 from techiev2/events

Fixes key for events json response
Fix for reassigning task to creator when owner is removed from Event
Fixes flow with bulk update operation including unchanged task owner
Merge pull request #75 from techiev2/events

Fix for reassigning task to creator when owner is removed from Event
Merge pull request #76 from techiev2/tasks

Fixes flow with bulk update operation including unchanged task owner
Merge pull request #77 from techiev2/invitations

Adds event invitation handles with accept/decline flow