Fix module package.json file copying

The package.json files in the module dirs were not copied
properly due to the grunt-contrib-copy update. Fix that
by adding an expand clause to the copy tasks.

gruntfile.js

@@ -231,6 +231,7 @@ module.exports = function(grunt) {
                 }
             },
             modulesPackageDef: {
+                expand: true,
                 src: localCfg.packageJsonFilePath,
                 dest: localCfg.outModulesDir + "/",
                 options: {
@@ -254,6 +255,7 @@ module.exports = function(grunt) {
                 }
             },
             childPackageFiles: {
+                expand: true,
                 src: [
                     localCfg.srcDir + "/**/package.json",
                     "!./package.json",