Bug 945284 - Bump gaiatest version to 0.20. r=dhunt
Bug 946769 - Trying to fix the egde gesture marionette test intermittent
by properly waiting for the end of the last app-opening transition.
Merge pull request #14509 from etiennesegonzac/bug-946769-edge-gesture-intermittent

Bug 946769 - Trying to fix the egde gesture marionette test intermittent
Disable failing tests