Check for VS 2015: it doesn`t support stdint.h

[aalex]

Visual Studio 2015 doesn't support stdint.h yet, so we should include msinttypes/stdint.h instead of stdint.h

[coveralls]

Coverage remained the same at 100.0% when pulling a05b922 on aalex:fix-vs2015-stdint-include into 5e8a382 on miloyip:master.

[pah]

Why is this needed in your environment? What error do you see otherwise?

The Appveyor build is successful on MSVC 2015 for the current master, without using the local stdint.h implementation.

[aalex]

It seems like I can't reproduce the error right now.
It's documented here: http://stackoverflow.com/questions/126279/c99-stdint-h-header-and-ms-visual-studio

[pah]

The stackoverflow question is pretty old (2008). In the answers, it's also documented, that Visual Studio supports <stdint.h> (to some extent) since 2010.

[miloyip]

Appveyor shows that RapidJSON can be successfully built under VC2010 to VC2015.
So I close this now.