Merge remote-tracking branch 'vaidik/sms_with_attachment'
Migrate messages app locators to By class
Migrate e.me app to use the new search and remove the old app object

Conflicts:
	gaiatest/tests/everythingme/manifest.ini
Revert switch_to_camera locator to more versatile locator
Fix bad camera frame locator
update travis CI to use b2g-26