Merge pull request #1047 from d-reinhold/bundle-exec-compass

Grunt task for compass should prefix command with 'bundle exec'

- Merges #1047

grunt/config/compass.js

@@ -5,6 +5,7 @@ module.exports = {
       sassDir: 'src/html',
       outputStyle: 'compact',
       noLineComments: true,
+      bundleExec: true
     }
   }
 };