ReactiveCocoa/ReactiveCocoa — pull request #330 by jspahrsummers (2013-02-18 18:50:09+00:00)
Title: Add a section about indentation style

[Preview](https://github.com/ReactiveCocoa/ReactiveCocoa/blob/signal-chain-style/Documentation/DesignGuidelines.md#indent-stream-operations-consistently)

CC @alanjrogers @dannygreg