Use /02 instead of /0x flag for msvc compiler when building optimised.
Removed some debug print messages in cake.msvs module.
Add support for Visual Studio Express 2013 for Desktop.

The findMsvcCompiler() now falls back to using x86_amd64 compiler if there
is no native amd64 compiler as WDExpress2013 doesn't include a native x64
bit compiler.