Created system volume class

binds/system/volume.lua

@@ -1,7 +1,7 @@
 return gears.table.join(
 	awful.key( {}, "XF86AudioRaiseVolume",
 		function ()
-			wrapper.volume.up()
+			vol:up()
 		end,
 		{
 			description = "Volume up",
@@ -11,7 +11,7 @@ return gears.table.join(
 
 	awful.key( {}, "XF86AudioLowerVolume",
 		function ()
-			wrapper.volume.down()
+			vol:down()
 		end,
 		{
 			description = "Volume down",
@@ -21,7 +21,7 @@ return gears.table.join(
 
 	awful.key( {}, "XF86AudioMute",
 		function ()
-			wrapper.volume.togglemute()
+			vol:togglemute()
 		end,
 		{
 			description = "Mute",