Add command line flag handling to xml_to_json.py
Add command line flag handling to xml_to_json.py

It is now possible to save the full text of the article at each
revision, and to save only the last revision. This will allow extracting
of the final text of an article.

tiffanyj41/hermes,tiffanyj41/hermes,tiffanyj41/hermes,tiffanyj41/hermes