Added jshint, clean and image plugins to lint JS files, remove build images and compress images respectively

Gruntfile.js

@@ -1,6 +1,15 @@
-'use strict';
+/*!
+ * Bootstrap's Gruntfile
+ * http://getbootstrap.com
+ * Copyright 2013-2015 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+
 module.exports = function (grunt) {
   
+  'use strict';
+
   grunt.initConfig({
     watch: {
       // If any .less file changes in directory "build/less/" run the "less"-task.
@@ -86,15 +95,40 @@ module.exports = function (grunt) {
         }
       }
     },
-    cssjanus: {
-      build: {
-        files: {
-          'dist/css/AdminLTE-rtl.css': 'dist/css/AdminLTE.css',
-          'dist/css/AdminLTE-rtl.min.css': 'dist/css/AdminLTE.min.css',
-          'bootstrap/css/bootstrap-rtl.css': 'bootstrap/css/bootstrap.css',
-          'bootstrap/css/bootstrap-rtl.min.css': 'bootstrap/css/bootstrap.min.css'
+    
+    // Optimize images
+    image: {
+      dynamic: {
+        files: [{
+          expand: true,
+          cwd: 'build/img/', 
+          src: ['**/*.{png,jpg,gif,svg}'],
+          dest: 'dist/img/'
+        }]
       }
+    },
+    
+    // Validate JS code
+    jshint: {
+      options: {
+        jshintrc: '.jshintrc'
+      },
+      core: {
+        src: 'dist/js/app.js'
+      },
+      demo: {
+        src: 'dist/js/demo.js'
+      },
+      pages: {
+        src: 'dist/js/pages/*.js'
       }
+    },
+    
+    // Delete images in build directory
+    // After compressing the images in the build/img dir, there is no need
+    // for them
+    clean: {
+      build: ["build/img/*"]
     }
   });
 
@@ -108,8 +142,12 @@ module.exports = function (grunt) {
   grunt.loadNpmTasks('grunt-contrib-uglify');
   // Include Files Within HTML
   grunt.loadNpmTasks('grunt-includes');
-  // Convert CSS to RTL
-  grunt.loadNpmTasks('grunt-cssjanus');
+  // Optimize images
+  grunt.loadNpmTasks('grunt-image');
+  // Validate JS code
+  grunt.loadNpmTasks('grunt-contrib-jshint');
+  // Delete not needed files
+  grunt.loadNpmTasks('grunt-contrib-clean');
 
   // The default task (running "grunt" in console) is "watch"
   grunt.registerTask('default', ['watch']);