[CMake] FindPythonLibs patches for version searching and frameworks

[David Gobbi]

Hi All,

I've attached three suggested patches for cmake.

The first is trivial, it simply adds Python 3.5 and 3.6 to the search list.

The second removes the long-deprecated PYTHON_INCLUDE_PATH as a suggestion
for PYTHON_INCLUDE_DIR.

The third does two important things: 1) it fixes bugs for searching for
specific versions of the libs and headers for framework installs of Python
on OS X, and 2) it doesn't search for the include directory until after
library has been found, so that it can use the library version to direct
the search for the include directory.

Any comments on these patches would be appreciated.

Cheers,
 - David
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