Updated WebSocket++ to 0.4.0

- Updated WebSocket++ to 0.4.0, now works with Xcode 6.1
- Removed `libboost_random.a` and `libboost_regex.a` on OSX as they are included in C++11 which are used since Xcode 5
- Updated Boost library to 1.55.0 for Visual Studio 2012 and 2013
- Updated cinderblock.xml