Switch to "grunt-html" for validating docs.

It requires Java installed, but it's faster.

Gruntfile.js

@@ -298,20 +298,14 @@ module.exports = function (grunt) {
       }
     },
 
-    validation: {
+    htmllint: {
       options: {
-        charset: 'utf-8',
-        doctype: 'HTML5',
-        failHard: true,
-        reset: true,
-        relaxerror: [
-          'Attribute ontouchstart not allowed on element body at this point.',
-          'Consider using the h1 element as a top-level heading only \\(all h1 elements are treated as top-level headings by many screen readers and other tools\\)\\.'
+        ignore: [
+          'Attribute "ontouchstart" not allowed on element "body" at this point.',
+          'Consider using the "h1" element as a top-level heading only (all "h1" elements are treated as top-level headings by many screen readers and other tools).'
         ]
       },
-      files: {
-        src: '_site/**/*.html'
-      }
+      src: '_site/**/*.html'
     },
 
     sed: {
@@ -346,7 +340,7 @@ module.exports = function (grunt) {
   grunt.registerTask('dist-css', ['sass', 'autoprefixer', 'usebanner', 'csscomb', 'cssmin']);
   grunt.registerTask('dist-js', ['concat', 'uglify']);
   grunt.registerTask('dist', ['clean', 'dist-css', 'dist-js', 'copy', 'build-ratchicons-data']);
-  grunt.registerTask('validate-html', ['jekyll', 'validation']);
+  grunt.registerTask('validate-html', ['jekyll', 'htmllint']);
   grunt.registerTask('build', ['dist']);
   grunt.registerTask('default', ['dist']);
   grunt.registerTask('test', ['dist', 'csslint', 'jshint', 'jscs', 'validate-html']);

package.json

@@ -40,7 +40,7 @@
     "grunt-contrib-uglify": "~0.8.0",
     "grunt-contrib-watch": "~0.6.1",
     "grunt-csscomb": "~3.0.0",
-    "grunt-html-validation": "~0.1.18",
+    "grunt-html": "~3.0.0",
     "grunt-jekyll": "~0.4.2",
     "grunt-jscs": "~1.5.0",
     "grunt-sed": "~0.1.1",