add done-field to db scheme; add checkboxes for read, update and create; start to build some kind of panel to show tasks as shown in the mockup
task list as partial; new task cannot be done at creation; list only title and status; filter list by event
add 'add' button to tasks partial; set done status via ajax on index page
Merge branch 'dev' into feature/taskList
add test file for tasks
add user and task factories
Merge branch 'dev' into feature/respond_task

Conflicts:
	app/controllers/tasks_controller.rb
	app/views/tasks/_form.html.erb
	app/views/tasks/index.html.erb
	app/views/tasks/show.html.erb
	spec/factories/event.rb
	spec/factories/task.rb