update gruntfile not to run validation + remove validation status

Gruntfile.js

@@ -169,7 +169,7 @@ module.exports = function(grunt) {
   grunt.registerTask('validate-html', ['jekyll', 'validation']);
 
   // Test task.
-  var testSubtasks = ['dist-css', 'jshint', 'qunit', 'validate-html'];
+  var testSubtasks = ['dist-css', 'jshint', 'qunit'];
   // Only run BrowserStack tests under Travis
   if (process.env.TRAVIS) {
     // Only run BrowserStack tests if this is a mainline commit in twbs/bootstrap, or you have your own BrowserStack key

validation-status.json

-{"_gh_pages/components/index.html":true,"_gh_pages/css/index.html":true,"_gh_pages/customize/index.html":true,"_gh_pages/examples/carousel/index.html":true,"_gh_pages/examples/grid/index.html":true,"_gh_pages/examples/jumbotron-narrow/index.html":true,"_gh_pages/examples/jumbotron/index.html":true,"_gh_pages/examples/justified-nav/index.html":true,"_gh_pages/examples/navbar-fixed-top/index.html":true,"_gh_pages/examples/navbar-static-top/index.html":true}
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