Upgrade shelljs to latest version

`cp -R` no longer creates missing directories, so add a new option to
the builder to create destination directories in advance.

external/builder.js

@@ -1,5 +1,5 @@
 /* jshint node:true */
-/* globals cp, ls, test */
+/* globals cp, ls, mkdir, test */
 
 'use strict';
 
@@ -274,13 +274,18 @@ exports.preprocessCSS = preprocessCSS;
  * Simplifies common build steps.
  * @param {object} setup
  *        .defines defines for preprocessors
+ *        .mkdirs array of directories to be created before copying/processing.
  *        .copy array of arrays of source and destination pairs of files to copy
  *        .preprocess array of arrays of source and destination pairs of files
  *                    run through preprocessor.
  */
 function build(setup) {
   var defines = setup.defines;
 
+  (setup.mkdirs || []).forEach(function(directory) {
+    mkdir('-p', directory);
+  });
+
   setup.copy.forEach(function(option) {
     var source = option[0];
     var destination = option[1];

make.js

@@ -26,6 +26,9 @@ function getBuildConfig(options) {
             OPERA: false,
             WEB: false,
         },
+        mkdirs: [
+            dest_dir + 'icons',
+        ],
         copy: [
             [SRC_DIR + 'lib', dest_dir],
             [SRC_DIR + 'icons/*.png', dest_dir + 'icons']
@@ -134,7 +137,6 @@ target.web = function() {
         },
         copy: [
             [SRC_DIR + 'search-worker.js', dest_dir],
-            [SRC_DIR + '*.css', dest_dir],
             [SRC_DIR + 'lib', dest_dir],
             [SRC_DIR + 'chrome-platform-info.js', dest_dir],
         ],

package.json

@@ -15,6 +15,6 @@
   "private": true,
   "devDependencies": {
     "less": "^2.7.1",
-    "shelljs": "0.2.6"
+    "shelljs": "^0.7.4"
   }
 }