add assignee_id to tasks
fix association and add dropdown
fix saving user_id
fix layout
add blank instead of prompt
added status to tasks and accept-/decline-action to task_controller
#30 add colors for status and improve task list views
fix belongs_to model bug
#30 refactor tasks_controller
#30 add value not assigned to task as default and if None is choosen. only can accept/decline when user_id is set
change Nicht zuweisen to None in task form attribute user_id
added translations and renamed task.status 'not assigned' to 'not_assigned'
Merge branch 'dev' into feature/respond_task
try tests
try tests 2
Send notifications emails when user is assigned to task
test added to test email notification when updating assigned user
add status decision for create
remove not_assigned as default for status
add tests for respond_tasks