Test delete a contact for #493
Test notification bar for #459
Note: double_tap() doesn't work.
Removed remove_confirm.py, move RemoveConfirm class into contact_form.py.
Merge remote-tracking branch 'mozilla/master' into issue_493

Conflicts:
	gaiatest/tests/contacts/manifest.ini
Merge remote-tracking branch 'mozilla/master' into issue_493
Merge remote-tracking branch 'mozilla/master' into issue_459
Unxfail some tests that are consistently passing
Use script to open notification bar.
Modified manifest.
Modified locators from xpath to css selector.
Merged `RemoveConfirm` into `EditContact` class.
Move test_wallpaper.py into settings/ folder
browser app object
remove xfail Bug 850658
Merge pull request #498 from bebef1987/browser_app

browser app object
Merge pull request #518 from bebef1987/remove_xfail

remove xfail Bug 850658
Merge pull request #517 from zacc/mv_wallpaper_test

Move test_wallpaper.py into settings/ folder
Split camera tests into two and into camera folder
Upaded fail message, removed unused code.
Merge pull request #519 from zacc/split_camera_tests

Split camera tests into two and into camera folder
Merge pull request #504 from askeing/issue_493

Test delete a contact for #493