Add new life cycle method to presenters that is called before they are hidden

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I propose an additional life cycle method to presenters that gets called just 
before the presenter is hidden. 

An example for this use is to integrate the GWT Editor framework with the leave 
confirmation of GWTP place manager so the presenter has a chance to check if 
the view is dirty (any changes made) before it is hidden. If there are changes 
the leave confirmation is set and the user will have to confirm that they want 
to leave the page.

Workaround:
Make a custom event, e.g BeforeNavigationEvent and build a custom place manager 
that fires it.

See this Google groups thread for discussion regarding this issue and example 
code of place manager:
https://groups.google.com/forum/#!topic/gwt-platform/JW4a3Pb6qhs

Original issue reported on code.google.com by sarkhee on 1 Aug 2012 at 12:42

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There's already onHide, couldn't you use that?

Original comment by goudreau...@gmail.com on 27 Nov 2012 at 2:41

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The problem is that onHide is called when the presenter is hidden, and there is 
no way of preventing it from being hidden in onHide (AFAIK).

In order to set the placeManager.setOnLeaveConfirmation() you need to do it 
before onHide().

Original comment by sarkhee on 27 Nov 2012 at 3:05

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