Migrate video app object to element.tap() method
Convert marionette.tap(el) to el.tap() for browser app
Xfail test that is failing on tap()
Fix one outstanding tap
Migrate clock app from marionette.tap to el.tap
Migrate Persona app object to el.tap()

Conflicts:

	gaiatest/apps/persona/regions/login.py
migrate fmapp to el.tap()
migrate email to el.tap()
Migrate gallery app to el.tap()