Version 1.2.0

Date: 17-Jun-2015

• Upgrade sortable plugin to [use new fork]((https://github.com/voidberg/html5sortable).
• (enh #5): Allow multiple connected sortables on single page. With this enhancement, the connected
  property will follow these rules:
  • if set to false or null/empty this widget will not be connected to any other sortable widget.
  • if set to true, this widget will be connected to all other sortable widgets on the page with connected property set to true.
  • if set to a string - this widget will be connected with other sortable widgets matching the same connected string value.
• (enh #7): Correct documentation link.
• (enh #9): Set composer version dependencies.