New - licensing: DataTables is now available under the MIT license

- Full license available here: http://datatables.net/license_mit

- Note that this effectively makes the BSD and GPLv2 licenses that
  DataTables is also available under redundant since the MIT is the most
  relaxed of these licenses. At some point in the not too distant
  future, it would make sense to remove these two licenses and have
  DataTables available under only the MIT license.