hover callbacks; r=ahocevar (Closes#1655)
This means that On the SelectFeature control hover can no longer be set on the
SelectFeature control after the control has been initialized: must be passed at
initialize time. Example has been updated.
git-svn-id: http://svn.openlayers.org/trunk/openlayers@7682 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf