Bug 1014484 - Fix 'toString is read-only' errors on B2G. r=froydnj
Bug 1020874 - Add optional parameters x and y to Action.long_press(). r=mdas

* Action.long_press() now accepts optional parameters x and y as
  Action.press() does.
* Add test cases in test_single_finger.py and
  test_single_finger_desktop.py.
Bug 1021351 - Update settings db version for 2.0. r=gwagner