Update for CocoaPods

Updated pod spec so it passes the "pod spec lint" testing. Version number was reduced to 0.0.1 because there is no tag to reference in the repo, and this is the only version number that will allow you to not include a tag reference when you specify the source.

**Request:** git tags with version numbers so they can be referenced for future CocoaPod specs. I'm don't think this can be done via pull request. I've included a tag in my fork to try.