Bug 926944 - Add a recipient to an SMS using the Contacts app, r=zac

Conflicts:
	tests/python/gaia-ui-tests/gaiatest/apps/contacts/app.py
Merge pull request #13322 from bobsilverberg/cp926944

Bug 926944 - Add a recipient to an SMS using the Contacts app
Bug 920023 - Add gaia command line interface to gaiatest. r=wlach
Bug 922850 - Add hardware button simulation to the Gaia command line tool. r=wlachance