Enhancing and adding a cloud layout to the "Popular Tags" module.

* Adds a new layout "cloud" to the module which shows tags in different sizes based on the item count
* Adds additional options to sort the list after title or randomized and also ascending or descending
* Adds the option to display the item count
* Changed the description of the module to reflect the new functions

Tracker: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31187