Fixes #93 10.7 doesn't support method signatures w/quotes

So, it looks like 10.7 suffers an issue where method signatures can’t contain quotes. iOS 5 also had this same issue. I was inspired by @rabovik's function to remove the quotes for iOS 5 method signatures here. See
https://github.com/OliverLetterer/SLObjectiveCRuntimeAdditions/pull/2 for more info