Add pygments parser option

global now builds a pygments parser by default. Make this work with a --with-pygments option to the recipe.

> On Sep 9, 2014, at 5:05 AM, Mike McQuaid <notifications@github.com> wrote:
> gdal uses a resource to install numpy. We should do similarly here to install pygments.
> 
What I’m not getting is how python_parser.py is supposed to find the private libexec path that the pygments module is being installed in. Python only looks in specific places for modules, and this can only be extended by using PYTHONPATH environment variable (at runtime), or through python code itself in the script. Both solutions will require patching the global source code. Is this the way we want to do this then?

Thanks,
Chris.