Bumping marionette_client dependency to 0.5.31, to pick up greatness; r=jgriffin
test_camera_multiple_shots.py Wait for filmstrip class as marionette workaround

Conflicts:

	gaiatest/tests/camera/manifest.ini
Unxfail test_marketplace_search_and_install_app.py
update TestNotificationBartest
test_notification_bar.py Change the wait for the notification bar to be displayed.
Old code was failing due to the app update notification interrupting.
fullscreen_video.py (youtube test): Update wait locator in app object
Push marionette_client up to 0.5.32