Move csslint overrides in Gruntfile.js.

This works around https://github.com/gruntjs/grunt-contrib-csslint/issues/26

Gruntfile.js

@@ -89,9 +89,13 @@ module.exports = function (grunt) {
       examples: [
         'docs/examples/**/*.css'
       ],
-      docs: [
-        'docs/assets/css/docs.css'
-      ]
+      docs: {
+        options: {
+          'ids': false,
+          'overqualified-elements': false
+        },
+        src: ['docs/assets/css/docs.css']
+      }
     },
 
     concat: {

docs/assets/css/docs.css

-/*csslint ids: false, overqualified-elements: false, fallback-colors: false*/
-
 /*!
  * Bootstrap Docs (http://getbootstrap.com)
  * Copyright 2011-2014 Twitter, Inc.