Merge pull request #10 from minetest-mods/player_assignment_not_case_sensitive

Compare player assignment non case sensitive

skin_meta_api.lua

@@ -73,7 +73,6 @@ end
 
 function skin_class:is_applicable_for_player(playername)
 	local assigned_player = self:get_meta("playername")
-	return assigned_player == nil or
-			assigned_player == playername or
-			assigned_player == true
+	return assigned_player == nil or assigned_player == true or
+			(assigned_player:lower() == playername:lower())
 end