add some packages

node_modules/clean-css/lib/reader/rebase-remote-map.js

@@ -0,0 +1,14 @@
+var path = require('path');
+var url = require('url');
+
+function rebaseRemoteMap(sourceMap, sourceUri) {
+  var sourceDirectory = path.dirname(sourceUri);
+
+  sourceMap.sources = sourceMap.sources.map(function(source) {
+    return url.resolve(sourceDirectory, source);
+  });
+
+  return sourceMap;
+}
+
+module.exports = rebaseRemoteMap;