Remove hack/workaround for jshint/grunt bug that's now fixed

See gruntjs/grunt-contrib-jshint#86

Author: cvrebert

Gruntfile.js

@@ -28,7 +28,6 @@ module.exports = function(grunt) {
         },
         jshint: {
             options: {
-                ignores: [],// HACK: workaround https://github.com/gruntjs/grunt-contrib-jshint/issues/86
                 jshintrc: 'js/.jshintrc'
             },
             gruntfile: {