Now using ajax to retrieve the feeds

Instead of relying on PHP for all backend, most of the work is done
with javascript. PHP is still used as a database interface and to
make remote jaxa requests (modern browsers have a "same origin"
restriciton for javascript which prevents it from making remote
requests).

The feeds are still not ordered in the list.
Corrected feed sorting once more.

Sorting stopped working after the change to AJAX.
It's now working properly once more.