Replace hard coded paths to Xcode.app with build environment provided paths
Update clang-format

This update includes a fix for NSDictionary literals when using Allman
or Always as the BreakBeforeBraces setting. See
http://llvm.org/bugs/show_bug.cgi?id=19854
Merge branch 'master' into clang-format-with-dict-literal-fixes
Merge pull request #38 from tonyarnold/clang-format-with-dict-literal-fixes

Clang format with NSDictionary literal fixes