Ignore Visual C++ 2013 warnings
Use float constants to prevent double->float conversion warning
Remove unneeded #include <nan.h>

- Already included by "Canvas.h"
Duplicate "msvc_settings" for "Debug" configuration

- Can't get shared configuration working for "ExceptionHandling"
Merge pull request #441 from pandell/ignore-winwarnings

Ignore Visual C++ 2013 compilation warnings