Integrate Process into CLI

[gtalarico]

[gtalarico]

The calls to process_stubs.py should be abstracted away an packaged into the CLI api as it was done with make_stubs.py

The placeholder cli command is here:
https://github.com/gtalarico/ironpython-stubs/blob/master/ironstubs/__main__.py#L45

It should accept options for the stubs path and pass those into process_stubs.py

TLDR

Instead of running:

$ ipy ironstubs/process_stubs.py

We should be able to run:

$ ipy -m ironstubs make RhinoCommon
and 
$ ipy -m ironstubs [process/minify] relases/RhinoCommon
# or something like that..