added visual studio 2013 preview version
Merge pull request #26 from abenedykt/master

added version for VS2013 Preview
Add C++ fields for VS2012
Add CppGlobalVariable type
Merge pull request #27 from pmrowla/master

Add C++ fields for VS2012
Add C++ fields for VS2013
Regenerate VS2013 vssettings
Merge pull request #28 from pmrowla/vs2013-cpp

Add C++ fields for VS2013
Merge remote-tracking branch 'upstream/master'