Make parsing on multiple files and strings possible
Add tool to create a Cython pxd file

Added a python script called run.py which creates a Cython pxd
file from a single header file (which might include additional
things). The produced pxd file can be used directly with Cython
without further manual modifications.

Example usage:

    run.py -i ~/mycode/inc -i libme/me.h me.pxd'

You can specify multiple '-i' if you want to include more
directories.
Merge pull request #2 from vmx/run-tool

Simple tool to create pxd files