memory is not released when browsing through pictures in a folder

First of all, if you have any Haxies, InputManagers, SIMBL plugins or
similar operating system hacks installed, please remove them first, restart
the program, and make sure the bug is reproducible without them.

What steps will reproduce the problem?
1. Open a folder full of image files 
2. Browse images using space bar or the next button
3. OS memory gets locked up

What is the expected output? What do you see instead?
Ideally once you move to the next image, the previous image must be closed and 
memory released. That is not happening, Memory is still being retained and once 
you view large number of pictures, OS gets sluggish and the only solution is to 
close Xee.

What version of the product are you using? On what operating system?
Xee 2.2, OS X 10.8.2

Please provide any additional information below.

Original issue reported on code.google.com by nikhles...@gmail.com on 27 Nov 2012 at 3:29

Merged into: #287

hex0cter / xee

memory is not released when browsing through pictures in a folder #315