ReactiveCocoa/ReactiveCocoa — pull request #337 by js (2013-02-19 20:37:32+00:00)
Title: Set usesTabs=1 for the pbxproj

At least in the latest Xcode this will make all project files use
tabs, even if spaces is set as the indentation method in Xcode
Preferences.

I feel kind of silly sending a pull request for this, but it makes it easier for us spaces-freaks without having to remember to toggle the global indentation settings.