admin: Add administrator panel

The snf-admin-app is currently a port of the helpdesk app which resided
under Cyclades. The new url for this app is "^admin/".
admin: Add database router
admin: Add accept/reject functionality
admin: Integrate astakos/cyclades stats

Print a dictionary with the astakos and cyclades stats.

WARNING: The account check is disabled for testing reasons. It will be
re-enabled in later versions.
admin: Add user list in index

Add to the index page a user list, filters that operate in it as well as
actions.
admin: Apply actions to users conditionally
admin: Add new Astakos states

The user will be considered to be in ONE of the following states:

Active: The user is activated and moderated.
Inactive: The user is moderated but may be rejected or inactive.
Pending moderation: The email of the user is verified but the user is
not moderated.
Pending verification: The user's mail is not verified.

This state is reflected in the user list as well as in the <tr> of the
html template.
admin: More data state from <tr> to <td>
admin-ui: Update jquery (v1.7.2 -> v1.11.0 min)
admin-ui: Add dataTables plugin (v1.9.4 min)

To be used for paginate, search and filter tables content.
admin-ui: Add sass file and unify the custom css

In the file extra.css are now included the most recent design updates.
admin-ui: Update view and functionality of items list
admin-ui: Fix css issues

Included all relative files.
admin: Make templates more abstract
admin: Add first iteration for filters
admin: Simplify index template
admin-ui: Add formatted view of stats json
admin-ui: Fix html
admin-ui: Show in navigation bar current place.
admin: Add link to details in user index