* Add audit logging for negative reactions
This change saves requests that create negative reactions to the audit
log. We need to be monitoring admin and moderator actions throughout the
app to increase visiblity on how our tools are being used and identify
abuse.
Additionally, this will help east concerns about giving elevated users
more powerful tools.
* Add a basic UI for moderator audit logs
* Log experience level ratings
* Log tag adjustments
* UI tweaks for moderator actions log
* Add logging to internal reactions controller
* Add logging for admin actions on users and articles
* Add searching to the moderator actions table
* Move audit instrumentation out of concern
We are able to use a PORO here instead of using a Rails concern. Moving
this also makes syntax to audit something quite a bit more explicit and
obvious to future developers
* Change moderator logs pagination page length
* Move auditing to after action filters
* Add moderator actions to the internal navbar
* Add request spec for internal moderator actions
* Use request params to populate AuditLog slug
