- Ovum drop and previous movements could return a different location
  and origin of coordiantes of ovum view frame.
  They were not reflecting the same point of the ovum's view when the
  library handled a gesture which location is offset from the center
  of the ovum's view.

  This fix makes sure that both dropping and moving use the same reference
  point in all cases.
Merge pull request #14 from Oblong/inconsistency-move-drop-locations

- Ovum drop and previous movements could return a different location