Pagination in the list of servers, rooms and recordings

[mconf-daileon]

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Author Name: Leonardo Daronco (Leonardo Daronco) Original Redmine Issue: 801, http://dev.mconf.org/redmine/issues/801 Original Date: 2013-05-30

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Add pagination to the list of servers, rooms and recordings. For recordings specially, since it will easily reach a big amount of items.

[daronco]

Part of this should be solved by #856 and #857.