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
Merge pull request #1033 from bobsilverberg/settings_app2

Create Settings app object
Add wait to bolster test_dialer_add_contact
Merge pull request #1050 from bobsilverberg/fix_add_contact

Add wait to bolster test_dialer_add_contact
Email tests unxfailed - Bug 888284 resolved
Merge pull request #1052 from zacc/unxfail_email_tests

Email tests unxfailed - Bug 888284 resolved
Added wait to fix test_sms.py

Added wait in init

Replaced wait