Add package versions to some of the packages or fix existing ones to conform to nixpkgs conventions.

pkgs/applications/misc/redshift/default.nix

@@ -3,10 +3,11 @@
   randrproto, xcbutil, xf86vidmodeproto }:
 
 stdenv.mkDerivation rec {
-  name = "redshift";
+  pname = "redshift";
   version = "1.6";
+  name = "${pname}-${version}";
   src = fetchurl {
-    url = "http://launchpad.net/${name}/trunk/${version}/+download/${name}-${version}.tar.bz2";
+    url = "http://launchpad.net/${pname}/trunk/${version}/+download/${pname}-${version}.tar.bz2";
     sha256 = "0g46zhqnx3y2fssmyjgaardzhjw1j29l1dbc2kmccw9wxqfla1wi";
   };
 
@@ -25,4 +26,4 @@ stdenv.mkDerivation rec {
     license = "GPLv3+";
     homepage = "http://jonls.dk/redshift";
   }; 
-}
+}