potential timing issue on upload verify, refs #436

add a sleep loop to potentially avoid failure due to the layer
not appearing visible in geoserver quickly enough
thumbs - fix loadevent, add thumb exists, ref #503
latest OL, see https://github.com/opengeo/mapstory/issues/507
Merge branch 'mapstory' of https://github.com/opengeo/geonode into mapstory
fullscreen mapviewer should have timeline see https://github.com/opengeo/mapstory/issues/506
latest gxp to fix https://github.com/opengeo/mapstory/issues/458
fix issue reported by @ischneider in https://github.com/opengeo/mapstory/issues/506#issuecomment-13393568
use gxp master now that stuff has been merged in
Merge branch 'mapstory' of github.com:opengeo/geonode into mapstory