[PATCH] clang-format: Add basic support for try and catch statements

[Daniel Jasper]

  First of all, thank you for working on this!

  There is already another patch out there that is doing the same thing: http://llvm-reviews.chandlerc.com/D2555. Not quite sure how to move forward. I'll ping that patch once more and pick it up if nothing happens. Generally:
  - I think it doesn't really make sense to parse try and cat independently. Especially, many coding styles require the "}" on the same line as the following "catch".
  - We have a unit testing infrastructure in cfe/unittests/Format/FormatTest.cpp, which we prefer over the file-check-based tests for various reasons.

http://llvm-reviews.chandlerc.com/D2731