Add ownership concepts to User and Board
Merge branch 'master' into board-owners
Use ownership features on BoardsController
Make @houndci happy
Merge remote-tracking branch 'origin/master' into board-owners
Use event.preventDefault() instead of disabling turbolinks

Ref.: https://github.com/catchup/catchup-web/commit/e642888e199b070ae3d9d2e5f73064de818499c6#commitcomment-8917548
Merge pull request #37 from catchup/board-owners

Board owners
Merge branch 'master' into move-preview-settings-to-board

Conflicts:
	db/schema.rb