This patch adds 3 files, PythonModule.cmake, FindPythonMako.cmake and
FindPythonNumpy.cmake.

PythonModule provides a simple function for running python and parsing
the version strings, each FindPython*.cmake then just calls that
function, and then calls the find_package_handle_standard_args macro for
simple, standard finding. This is much more in line with how the core
cmake modules work, and makes is trivial to add additional python
modules with all of the standard cmake awesomeness like version
checking.

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>