fix(build): exclued bower_components from the grunt rev and usemin blocks

closes angular-fullstack#522

Author: kingcody

Diff for: app/templates/Gruntfile.js

@@ -286,8 +286,8 @@ module.exports = function (grunt) {
       dist: {
         files: {
           src: [
-            '<%%= yeoman.dist %>/client/{,*/}*.js',
-            '<%%= yeoman.dist %>/client/{,*/}*.css',
+            '<%%= yeoman.dist %>/client/!(bower_components)/{,*/}*.js',
+            '<%%= yeoman.dist %>/client/!(bower_components)/{,*/}*.css',
             '<%%= yeoman.dist %>/client/assets/images/{,*/}*.{png,jpg,jpeg,gif,webp,svg}',
             '<%%= yeoman.dist %>/client/assets/fonts/*'
           ]
@@ -307,9 +307,9 @@ module.exports = function (grunt) {
 
     // Performs rewrites based on rev and the useminPrepare configuration
     usemin: {
-      html: ['<%%= yeoman.dist %>/client/{,*/}*.html'],
-      css: ['<%%= yeoman.dist %>/client/{,*/}*.css'],
-      js: ['<%%= yeoman.dist %>/client/{,*/}*.js'],
+      html: ['<%%= yeoman.dist %>/client/!(bower_components)/{,*/}*.html'],
+      css: ['<%%= yeoman.dist %>/client/!(bower_components)/{,*/}*.css'],
+      js: ['<%%= yeoman.dist %>/client/!(bower_components)/{,*/}*.js'],
       options: {
         assetsDirs: [
           '<%%= yeoman.dist %>/client',