Squashed commit of the following:

commit 2f7c82852079adc591f25f3a68fb3100fb0686dd
Author: shinnn <dminor.sw@gmail.com>
Date:   Tue Jan 21 13:23:33 2014 +0900

    Update grunt-contrib-nodeunit

commit 39b6a6435ee94aa38b12592a9cb5edbbbe88d69b
Author: shinnn <dminor.sw@gmail.com>
Date:   Tue Jan 21 13:23:23 2014 +0900

    remove grunt.util._.clone

    Because grunt.util._ is deprecated.

Closes gh-136.
Updates for 0.9.0