Rename environment.systemVariables -> environment.sessionVariables

This makes it clearer that they're part of PAM sessions.
Set session variables in the shell as well
Added typespeed package.
Working on a package for nitrogen.
Oops, typespeed branch got merged somehow. Removed.
Nitrogen build working. Missing custom icons in GUI.
Merge branch 'nitrogen' of github.com:/auntieNeo/nixpkgs into nitrogen

Conflicts:
	pkgs/tools/X11/nitrogen/default.nix
Merge branch 'master' into nitrogen. Added maintainer and license.

Conflicts:
	pkgs/tools/X11/nitrogen/default.nix
Added a long description. Added the patch file.
Merge pull request #2931 from auntieNeo/nitrogen

Added nitrogen package
Update CL-Launch
Update Wine unstable version
Update GlusterFS to 3.4.3