test_MMI Fixes #47
Add test for enabling cell data via Settings app
Use SpecialPowers in place of switch_to_frame for getting and setting settings
Merge remote-tracking branch 'mozilla/master' into MMI
check testvars IMEI value
Remove the permission at the end
Respond to cell data prompt and xfail due to bug 837664
add IMEI value in testvars
Merge pull request #364 from bobsilverberg/cd

Add test for enabling cell data via Settings app
Merge pull request #368 from bobsilverberg/settings

Use SpecialPowers in place of switch_to_frame for getting and setting settings
Fix getAllContacts when an error occurs
Switch to the system app context when using mobile data or wifi APIs
Merge pull request #351 from bebef1987/MMI

Dialer MMI code tests
Merge pull request #373 from davehunt/fix-cell-wifi

Switch to the system app context when using mobile data or wifi APIs
Merge remote-tracking branch 'jonallengriffin/allcontacts'
Don't remove settings permissions as this causes bad things to happen
Merge pull request #376 from davehunt/fix-settings

Don't remove settings permissions as this causes bad things to happen
Merge remote-tracking branch 'mozilla/master' into add_app
add self.is_element_displayed