CocoaPods/Specs — pull request #9198 by sts2055 (2014-03-13 16:39:49+00:00)
Title: Swap source since old URL returns a 404

The old source: https://github.com/zynga/FontLabel.git
Is not reachable and returns a 404, Page not found.

Not sure if the repo became private or whether it was removed.
This pull request suggests to replace s.source with another existing repo on github that is reachable.