Added Redraw function to reflect changes on the <select>

Currently, i have to update values on a select with Ajax so i added a redraw function to call on ajax success (or whatever you want)

ex:(coffee)
....
request = $.post url, data
request.success (data) =>
   group_options = HandlebarsTemplates['groups/group_options'] { groups: data }
   $('select#groups').html group_options
   $('select#groups').dropkick 'redraw' 
 ....