Better way of specifying game's terminators
Undo better way of specifying game's terminators

It just won't work.
Actually undo that
Some validations in Participation
Revert "Undo better way of specifying game's terminators"

This reverts commit 2489ca5aec127fbe2568137ef29ad4c333ff1bbf.

Conflicts:
	db/schema.rb
Migrations got ugly
Fix completed? Game method
Fix if logic
Teams can be added to games
Add Team.not_in_game method
Add All Teams button
Remove All Teams button
More compact paragraph