Added grunt contrib imagemin

Gruntfile.js

@@ -167,6 +167,24 @@ module.exports = function (grunt) {
       }
     },
 
+    /**
+     * Minifies PNG and JPG images
+     * https://github.com/gruntjs/grunt-contrib-imagemin
+    */
+    imagemin:{
+      static: {                          
+        options: {                       
+          optimizationLevel: 3
+        },
+        files: [{
+          expand: true,                     // Enable dynamic expansion
+          cwd: '<%= project.src %>/images', // Src matches are relative to this path
+          src: ['**/*.{png,jpg,gif}'],      // Actual patterns to match
+          dest: '<%= project.assets %>/img/'// Destination path prefix
+        }]
+      }
+    },
+
     /**
      * Runs tasks against changed watched files
      * https://github.com/gruntjs/grunt-contrib-watch
@@ -217,6 +235,7 @@ module.exports = function (grunt) {
   grunt.registerTask('build', [
     'sass:dist',
     'jshint',
+    'imagemin',
     'uglify'
   ]);
 

package.json

@@ -20,6 +20,7 @@
     "grunt-contrib-watch": "~0.4.4",
     "connect-livereload": "~0.2.0",
     "grunt-open": "~0.2.0",
-    "matchdep": "~0.1.2"
+    "matchdep": "~0.1.2",
+    "grunt-contrib-imagemin": "~0.3.0"
   }
 }