Invoke ConfigureEvent in the vtkCocoaRenderWindowInteractor.

The RenderWindowInterctors on all builds except for Cocoa invoke a
ConfigureEvent when the RenderWindow size changes.  This patch adds
the event for Cocoa.

Change-Id: I1aabc2376dbb028c4bd23d32ecd2c2d67da17464
Add catalyst web widget into VTK

Change-Id: I4c28d423590edc3728c609b956a1421334ff60aa
Added code to support a cache option for filebrowser widget.

This new option will allow code that uses the filebrowser to specify
whether or not to cache files read from the server when clicking on
a path.  If not using cache, files will be re-read from the server.

Change-Id: Ife4cc398d8589345b61f044b4a855d4246f54b5a
Merge branches 'cocoa-configure-event-rel', 'catalyst-web-rel' and 'pvweb-add-filebrowser-cache-option-rel' into release

Change-Id: I3ce26eaa5cf8b7ce4da5a92f13527f60228b6a03