0.4 -> 0.5

[Patches from Jakub Stachowski]
* Preview windows remains open after tracing the image
* Fixed a memory leak when calling the settings dialog
* Added drag and drop support

0.3 -> 0.4

[Patches from Jakub Stachowski]
* fixed a memory leak (QPixmap allocated and never deallocated)
* fixed a race condition in potrace execution
* Potracegui now uses any image format recognized by KDE
* Potracegui can use remote files

0.2 -> 0.3

* Updated potracegui to work with potrace 1.3
* Changed the options dialog to reflect potrace changes
