FTBFS on Windows with MSVC++ 9

[ghost]

Since quaternion.h looks for _MSC_VER, I assume that MSVC++ is an intended target for this package. However, after installing "Microsoft Visual C++ Compiler for Python 2.7" and invoking

pip install git+git://github.com/moble/quaternion

the build phase fails due to various problems that may be unique to MSVC++:

• The <math.h> functions isnan, isinf, and isfinite are apparently not available in quaternion.h.
• The C99 compound literal syntax (e.g. (quaternion) { w, x, y, z }) is not supported by MSVC++.

[moble]

I simply copied that _MSC_VER line from an older package that added quaternions to numpy. I have no access to any computers running Windows, so I can't really be of any help in solving these problems or testing to see if they work on Windows. But I'd be happy to incorporate any changes you can suggest, as long as they don't break things on other platforms.