Icon class resource cleanup to eliminate memory leaks

 * Quite a few resources were not being freed at all
 * Still needs closer look at the Background class which is also recreated
Fixed a bug where kdesk in verbose mode with a refresh would segfault

 * An argument to kprintf was missing.
Fixed memory leak in background class

 * The image imlib object was not bein release across refreshes
Merge pull request #42 from KanoComputing/leak

Eliminate memory leaks during refresh