admin: Add stats view

This view currently has a div that holds four URLs:

* data-astakos-stats: Simple stats for the astakos service
* data-cyclades-stats: Simple stats for the cyclades service
* data-astakos-stats-details: Verbose stats for astakos service
* data-cyclades-stats-details: Verbose stats for the cyclades service

Hit any of the above URL using as X-AUTH-TOKEN the token of the user,
will return a JSON with the above stats.
admin: Include stats view in tests
admin: Remove relic template
Merge branch 'feature-admin-stats' into feature-admin