DOC: fix comment in RatingScale
Merge branch 'master' of git://github.com/psychopy/psychopy

* 'master' of git://github.com/psychopy/psychopy:
  FF: image-based classes should use BaseVisual for contains() and overlaps()
ENH: RatingScale marker='hover'

- nice and minimal: effectively just a clickable set of text choices
ENH: RatingScale 'hover' more efficient implementation
Merge pull request #478 from jeremygray/master

RatingScale 'hover' style