add test cases of share menu verification
minor fixes
fix by several comments
remove unnecessary comment and add checking share list
fix
fix unknown error
remove target checking, use length to check if list is not empty
Add waiting mechanism to avoid failure.
minor fix
test_unlock_to_camera_with_passcode fix #479
[Gallery] Test return to tiles view
Setup: Push an image to the sdcard
    Load gallery
    Tap the image and wait for it to load
    Tap the tile view toolbar icon
    Assert that the app returns to the main/tile view screen
add return to tap_tile_view_button()
add manifest test_unlock_camera_with_passcode.py
PEP8 checking
Merge remote-tracking branch 'mozilla/master' into issue_474
Merge remote-tracking branch 'altsai/issue_474'
Merge pull request #604 from bebef1987/camera_pass

test_unlock_to_camera_with_passcode
added test to manifest.ini
Merge branch 'return-to-tiles'
Merge remote-tracking branch 'upstream/master'