Added CocoaPods pod spec for version 0.0.1

This pod spec successfully passed linting with CocoaPods 0.17.1.

I added 5.0 as the minimum iOS platform which is basically an artificial restraint. It's more about which iOS versions you're planning to support with this library in the future.

I also enabled usage of ARC for the pod. After browsing quickly through the source code that wouldn't be needed as of now so it's more a matter of personal preference for future development.

Thanks for this project btw, nice work. :)