Upgraded LWJGL to 2.9.1 and JInput to 2.0.5.

If you use the ClassiCubeLauncher and want to use LWJGL 2.9.1 now, you will have to use a special version that will not force LWJGL downgrade: http://www.fcraft.net/ccc/ClassiCubeLauncher58-LibVerificationDisabled.jar
You will also need to make sure that LWJGL 2.9.1 binaries are in your library path. You can get it from http://lwjgl.org/download.php