Revert "validate region"

This reverts commit db5591500872dd7963319f2b90cbd44ff5983b3e.
Revert "presence of region; lower case search"

This reverts commit e5a7d81354979a77729bda29d2754f6aae22ac4c.

Conflicts:
	app/controllers/bans_controller.rb
Revert "extend users by region"

This reverts commit c0061aa4f05dfd9f99b2a90ef34b42e78d768a46.
lower case search