uxrvt: put URxvt class into a configuration variable

rc.lua

@@ -46,6 +46,7 @@ os.execute("test -d " .. awful.util.getdir("cache") ..
 modkey = "Mod4"
 config = {}
 config.terminal = "urxvtcd --perl-lib " .. awful.util.getdir("config") .. "/lib/rxvt"
+config.termclass = "URxvt"
 config.layouts = {
    awful.layout.suit.tile,
    awful.layout.suit.tile.left,

rc/rules.lua

@@ -36,7 +36,7 @@ awful.rules.rules = {
      properties = { }, callback = awful.client.setslave },
    -- Should not be master
    { rule_any = { class =
-		  { "URxvt",
+		  { config.termclass,
 		    "Transmission-gtk",
 		    "Keepassx",
 		  }, instance = { "Download" }},

rc/tags.lua

@@ -61,7 +61,7 @@ shifty.config.apps = {
       tag = "im",
    },
    {
-      match = { "URxvt" },
+      match = { config.termclass },
       startup = {
          tag = "xterm"
       },