Refactor/move code in prep for running in production

- Allow for a --data-root cmd line option in update_events and update_cmds.
  This was a little tricky because of the dependence on django
  and required hiding imports within method/function calls in places.
  This was also the driver for moving update_events.py.  Update_cmds.py
  just came along for consistency.
- Add kadi/occweb.py.  Maybe move this outside later.
Add files for initial production release version 0.2