Updated spin_hour24() for marionette.flick(obj, x1, y1, x2, y2 ...) change.
- from percentage to pixels.
Updated _flick_to_image() for marionette.flick(obj, x1, y1, x2, y2 ...) change.
- from percentage to pixels.
Merge pull request #774 from askeing/issue_771

Updated gaiatest for marionette.flick change