Work on services
make services a core module
Merge branch 'master' of https://github.com/GeoNode/geonode into zip_remote
Add ESRI-leaflet plugin, use lazy loading for layers
Fix layer lookup
Assign bounds of cascaded layers
Set bbox to 4326 or web mercator depending on layer srid
A few other bug fixes
Merge branch 'master' of https://github.com/GeoNode/geonode into services_gn
Merge branch 'master' of https://github.com/GeoNode/geonode into services_gn
Merge pull request #1532 from mbertrand/services_gn

Services as core module