use head
Merge branch 'master' of github.com:orta/OROpenSubtitleDownloader

* 'master' of github.com:orta/OROpenSubtitleDownloader:
  [OROpenSubtitleDownloader generateUserAgent] now works on OS X too.
  Update the Podspec to Support both iOS and OSX.
  Switch the Pod's platform from iOS to OSX.