Merge pull request #17 from dwalkes/master

Fix download link for release 2.4.8
Adding additional dependency to libgtk2.0-dev.

On both my Linux installations, running this script was not enough. I also had to install libgtk2.0-dev. I added the dependency in the script.
Merge pull request #18 from DubbeleJ/patch-1

Adding additional dependency to libgtk2.0-dev.
Add RedHat install scripts