CocoaPods support

Note that the `.podspec` file won't pass the `pod spec lint` test in place yet since this isn't merged to the main repo. To check it, you can change the `s.source` username from `vokalinteractive` to `designatednerd` - I've already got the `1.1.1` tag functional in my repo. 

Once this is merged to the main repo, please tag the main repo with `1.1.1` (no v - CocoaPods only supports numerical versioning). 

Once it's merged and tagged, I'll submit a pull request to the main CocoaPods repo so it's visible globally. 

This PR would address issue #2 - Cocoapods Support.