LunarGLASS does not build with VS2015 Update 2

[danginsburg]

LunarGLASS does not build in VS2015. The use of _set_output_format is deprecated:

https://msdn.microsoft.com/en-us/library/0fatw238.aspx

Also, the redefinition of snprintf causes a #error in stdio.h:

#define snprintf _snprintf

I fixed all of these errors locally by changing the #ifdef _WIN32 to:

#if defined( _WIN32 ) && ( _MSC_VER < 1900 )

I can submit a merge request for these issues if you like.

[danginsburg]

Pull request pushed to #29