fix(docs): removes explicit protocol declaration for assets

fixes #513

Gruntfile.js

@@ -471,17 +471,17 @@ module.exports = function (grunt) {
         imageLink: 'http://angular-translate.github.io',
         startPage: '/guide',
         scripts: [
-          'http://getbootstrap.com/2.3.2/assets/js/bootstrap-dropdown.js',
-          'http://rawgithub.com/SlexAxton/messageformat.js/master/messageformat.js',
-          'http://rawgithub.com/SlexAxton/messageformat.js/master/locale/de.js',
-          'http://code.angularjs.org/1.1.5/angular.min.js',
-          'http://rawgithub.com/angular/bower-angular-cookies/master/angular-cookies.min.js',
-          'http://rawgithub.com/angular-translate/bower-angular-translate/master/angular-translate.min.js',
-          'http://rawgithub.com/angular-translate/bower-angular-translate-interpolation-messageformat/master/angular-translate-interpolation-messageformat.min.js',
-          'http://rawgithub.com/angular-translate/bower-angular-translate-storage-cookie/master/angular-translate-storage-cookie.min.js',
-          'http://rawgithub.com/angular-translate/bower-angular-translate-storage-local/master/angular-translate-storage-local.min.js',
-          'http://rawgithub.com/angular-translate/bower-angular-translate-loader-static-files/master/angular-translate-loader-static-files.min.js',
-          'http://rawgithub.com/angular-translate/bower-angular-translate-handler-log/master/angular-translate-handler-log.min.js'
+          '//getbootstrap.com/2.3.2/assets/js/bootstrap-dropdown.js',
+          '//rawgithub.com/SlexAxton/messageformat.js/master/messageformat.js',
+          '//rawgithub.com/SlexAxton/messageformat.js/master/locale/de.js',
+          '//code.angularjs.org/1.1.5/angular.min.js',
+          '//rawgithub.com/angular/bower-angular-cookies/master/angular-cookies.min.js',
+          '//rawgithub.com/angular-translate/bower-angular-translate/master/angular-translate.min.js',
+          '//rawgithub.com/angular-translate/bower-angular-translate-interpolation-messageformat/master/angular-translate-interpolation-messageformat.min.js',
+          '//rawgithub.com/angular-translate/bower-angular-translate-storage-cookie/master/angular-translate-storage-cookie.min.js',
+          '//rawgithub.com/angular-translate/bower-angular-translate-storage-local/master/angular-translate-storage-local.min.js',
+          '//rawgithub.com/angular-translate/bower-angular-translate-loader-static-files/master/angular-translate-loader-static-files.min.js',
+          '//rawgithub.com/angular-translate/bower-angular-translate-handler-log/master/angular-translate-handler-log.min.js'
         ],
         styles: ['docs/css/styles.css']
       },