Individual management page for rooms

[daronco]

Currently the list of recordings in the management section is at /bigbluebutton/rooms. This page is a simple adaptation of the views in BigbluebuttonRails, and it could be improved a lot.

The idea is to have a page that will be shown as an individual tab in the management section, similar to the tabs for the list of users and the list of spaces. This list would be visually similar to the lists of spaces and users, but showing information relevant to the rooms (ID, name, etc), would be paginated and would be searchable/filterable.
It should also include buttons to act over a meeting, including things like edit, join, end, view recordings, etc.

(Similar to #856.)