Fix one last check for settings.HAYSTACK_SEARCH.
Merge branch 'master' of https://github.com/GeoNode/geonode
Use the django static files finder to locate the document placeholder thumbnails.  Fixes #1447.
Fixes #1450
Formatted properly some doc pages in order to make it working properly with RTD theme.
Merge branch 'master' of github.com:GeoNode/geonode
Hack to avoid RTD to be confused, as per sphinx_rtd_theme documentation.