Refactor and tests (#14) (#15)

* Added tests, start refactor work on signals

* Update get_request_info function to work with dict objects, which
  would allow changing and inserting various fields easier
* Added a message formatter that will take our siem_data (created by
  updated function above) and format it as a valid json string, while
  stripping the open and closing brackets.
* Updated the signals handlers so that they use our new methods (defined
  above)
* Added tests for all the above

* variable name update

* Tests and refactor for middlewares

* Rename middlewares.py -> middleware.py

* Since name changed, needs updated here also

* Prevent error when user refresh logout page

* Add optional django-ipware integration

Co-authored-by: Andre Engelbrecht <andre@tehnode.co.uk>