Start 0.9.4 development
Cascade deletes for Request objects properly

Delete Modifiers and Actions when the parent Request is deleted, leave everything else otherwise.
Define cascades for auth models

Entities (Users, Groups) cannot be deleted cleanly. Removing them introduces lots of problems about what do to with things they've don eon requests they don't own, so I'm not even going to attempt to address them. On the other hand, APIKeys, Notes, Permissions, and Divisions are all delete-able now.
Merge branch 'cascades'

* cascades:
  Define cascades for auth models
  Cascade deletes for Request objects properly
Release 0.9.4: Cascade Across the Land!
Merge branch 'master' into release

* master:
  Release 0.9.4: Cascade Across the Land!
  Define cascades for auth models
  Cascade deletes for Request objects properly
  Start 0.9.4 development