Callback when user click outside editor dialog.

[chicomarques90]

It provides a way to call a function when clicking outside the editor. This can be used to resolve #416 whithout using ng-blur on "Roll Your Own" Edit Dialogs.

To use the new functionality simply enable "clickOutsideToClose" and suply a "clickOutsideCallback" function to be called when clicking outside editor dialog.

The Demo has been update to explain this new functionality.