MailCore/mailcore2 — pull request #431 by CodaFi (2013-10-25 22:53:42+00:00)
Title: Assume main thread

Per our [discussion](https://github.com/MailCore/mailcore2/commit/905b2415dae343af598d6f038e267d7f3af806f8#commitcomment-4424592). I also took the opportunity to convert the file from tabs to spaces, and add some documentation.