fix ios7 bug when getting cell view from superview

when gesture:view:viewIndex: message try to retrieve the table cell
object from the superview it crash, because there's a new view inside
the table cell view hierarchy, look here:
http://www.curiousfind.com/blog/date/2013/09.
Merge pull request #11 from nebiros/bug/io7-UITableViewCellScrollView

fix ios7 bug when getting cell view from superview