Adapting the class to my needs

XFramePeer instead of XToolkit for IntelliJ Idea 14 (Very Alpha State)

Taken from:
* https://wiki.gnome.org/Projects/GnomeShell/ApplicationBased#The_WM_CLASS_X_Window_property
* http://locademiaz.wordpress.com/2011/08/30/turn-your-java-apps-gnome-shell-friendly/
* http://blog.trifork.com/2011/01/09/make-intellij-idea-behave-properly-in-linux-docks/