Added Podspec For CocoaPods

I'm a fan of MAFormViewController and use CocoaPods heavily, so I added an initial podspec to the repo so I could include this in my project with it.

At the moment, off my fork you can include it in your project via CocoaPods by adding to the podfile
`pod 'MAFormViewController', :git => 'https://github.com/Whelton/MAFormViewController.git'`

If this were to be merged and any additional information added/corrected (license, author details, etc), then we can go ahead and submit it to the master CocoaPods repo for all to enjoy :)