Customize classes for table

MagicMirror offers helper classes in the main.css. Therefore, we give
the possibility to indicate the class that we want.

modules/default/weatherforecast/weatherforecast.js

@@ -36,6 +36,7 @@ Module.register("weatherforecast",{
 
 		appendLocationNameToHeader: true,
 		calendarClass: "calendar",
+    tableClass: "small",
 
 		roundTemp: false,
 
@@ -117,7 +118,7 @@ Module.register("weatherforecast",{
 		}
 
 		var table = document.createElement("table");
-		table.className = "small";
+		table.className = this.config.tableClass;
 
 		for (var f in this.forecast) {
 			var forecast = this.forecast[f];