Create Settings app object
Migrate airplane mode, bluetooth and cell data settings tests to the app
Migrate language and keyboard language tests to the app
Migrate do not track, gps, and media storage
Migrate passcode, wallpaper and wifi

Use self.apps.displayed_app instead of passing app to panel

Update to address review comments:
- change Airplane mode switch locator
- remove unnecessary parentheses

Conflicts:

	gaiatest/tests/settings/test_settings_change_language.py
	gaiatest/tests/settings/test_settings_wallpaper.py
Remove xfail for test_MMI.py
Add wait to bolster test_dialer_add_contact
Added wait to fix test_sms.py

Added wait in init

Replaced wait
Merge pull request #1044 from teodosia/fix-sent-sms

Added wait to fix test_sms.py
Merge pull request #1051 from teodosia/unxfail-mmi

Remove xfail for test_MMI.py