CocoaPods/CocoaPods — pull request #2700 by HeEAaD (2014-10-19 20:40:14+00:00)
Title: Improved sanitizing of configuration names which have a number prefix.

This pull request adds an underscore before the preprocessor definition if the configuration name has a number prefix.

The previous bugfix https://github.com/CocoaPods/CocoaPods/commit/e11291427d08b05bc13b801b6f3ded6fd36afd0a doesn't covers configuration names with a number prefix.