Add scripts for purging

add purge_service and purge_key methods, add entry_points scripts for purge_url, purge_service, and purge_key, append bitmonk# to version for this fork.

When installing this egg into a virtualenv, or into system python, there will be three new scripts created in the same directory as the python executable:

  purge_service
  purge_key
  purge_url

Each essentially takes the arguments of the respective function.  Could have better usage and error messages, but for now it's more convenient than not having scripts.