Document the limitation that there be only one pyx file. Update some variable naming accordingly.
Document the limitation that there be only one pyx file.
Update some variable naming accordingly.

insertinterestingnamehere/dynd-python,insertinterestingnamehere/dynd-python,insertinterestingnamehere/dynd-python,mwiebe/dynd-python,izaid/dynd-python,mwiebe/dynd-python,izaid/dynd-python,mwiebe/dynd-python,izaid/dynd-python,insertinterestingnamehere/dynd-python,ContinuumIO/dynd-python,ContinuumIO/dynd-python,mwiebe/dynd-python,izaid/dynd-python,ContinuumIO/dynd-python,ContinuumIO/dynd-python