Replaced deprecated symbols in iOS 6.x

Since at least 83% of the iOS user base is now using iOS 6.x, I would think it's pretty safe to clean up the code by removing the symbols that no longer should be used. Here are the changes I made.

One warning I didn't take care of is the following:

/Users/tciuro/Desktop/Momo/QuickDialog/quickdialog/QBadgeTableCell.m:32:21: 'contentStretch' is deprecated: first deprecated in iOS 6.0

This may need a more complex fix, so I'll leave it up to you ;-)

Regards,

-- Tito