DataTables ColVis plugin added 

Hi,

This is tiny plugin for datatables, adding simple way to show-hide table columns using a button in table's header. 

Files origin is DataTables plugins repository: https://github.com/DataTables/ColVis/tree/1.1.0
Popularity: 4th across datatables plugins sources. As popular as already added datatables-fixedheader, fresh version, contains number of important pull requests for compatibility fixes.

Thanks.