CocoaPods/CocoaPods — pull request #2139 by Noreaster76 (2014-05-16 16:17:01+00:00)
Title: Required commands

`hg` (and `git`, for that matter) is required to run the `install_subspecs` spec. As a result, this commit makes the Rake tasks die quickly if it is not installed.

/cc @fidothe