adding jquery-ui-rails for drag and drop tables

https://github.com/joliss/jquery-ui-rails
http://jqueryui.com/sortable/
http://isocra.com/2008/02/table-drag-and-drop-jquery-plugin/
http://www.solitr.com/blog/2012/02/jquery-ui-rails-gem-for-the-asset-pipeline/