ARC Conversion

In seeing the iOS7 build (which is looking good!), I thought I'd try to lend a hand in some way. So, I took a stab at an ARC conversion. I duplicated the used RegExKit methods in a category (NSString+Regex) and threw it into the converter. I didn't let it touch anything that I already knew was ARC compatible (IIViewDeck, AFN) but I did let it hit SBJSON. I'll probably take a look soon at removing SBJSON as well - yay removing external dependencies!

I have it running on my phone and it's looking ok, but if you'd like I can give you an update a bit further down the line on its stability.