Fixed: generate source maps when they are actually requested.

lib/loader.js

@@ -16,13 +16,17 @@ module.exports = function(content, map) {
 	var root = query.root;
 	var moduleMode = query.modules || query.module;
 	var camelCaseKeys = query.camelCase || query.camelcase;
+	var sourceMap = query.sourceMap || false;
 	var resolve = createResolver(query.alias);
 
-	if(map !== null && typeof map !== "string") {
+	if(sourceMap && map !== null && typeof map !== "string") {
 		map = JSON.stringify(map);
+	} else {
+		map = null;
 	}
 
 	processCss(content, map, {
+        moduleMode: moduleMode,
 		mode: moduleMode ? "local" : "global",
 		from: loaderUtils.getRemainingRequest(this),
 		to: loaderUtils.getCurrentRequest(this),