0.34 rc

Supersedes https://github.com/CocoaPods/CocoaPods/pull/1143 

Sister: https://github.com/CocoaPods/Core/pull/160
https://github.com/CocoaPods/Core/commit/2a6ec4cdfcf880ea65ce0644e863ec8d18f18967#diff-af43d9b054df97963fd9d8ac005422abR485