Selected Button States

Summary:
* select and unselect states
	* icon changes
	* background color changes on selected state

* bulk select still needs to be wired up, but the foundation is there.

Test Plan: click select buttons on Users/Tags views

Reviewers: shadowhand, rjmackay, eyedol

Reviewed By: shadowhand, rjmackay, eyedol

Subscribers: digitalafrican, dkobia

Maniphest Tasks: T190

Differential Revision: https://phabricator.ushahidi.com/D64