google-glog 0.3.4

• repository moved from code.google.com/p/google-glog to github.com/google/glog
• fixes for latest MSVS
• add libc++ support
• fix build issue in demangle.cc
• add callback for OpenObjectFileContainingPcAndGetStartAddress
• add StrError and replace posix_strerror_r call
• fix VC build by adding GOOGLE_GLOG_DLL_DECL
• style fix for C++11
• reduce dynamic allocation from 3 to 1 per log message
• attempt to improve mingw-w64 support
• support unordered_(map|set) by stl_logging