Added some functionality:
 - multi column sort
 - multi terms search
 - paggination option all -> '-1'
Merge branch 'master' of git://github.com/zpaulovics/ajax-datatables-rails into zpaulovics-master

Conflicts:
	lib/ajax-datatables-rails/base.rb
Merge branch 'zpaulovics-master'

Adds support for multi-column sorting and multi terms search.