add map_sdk.js and sdk_header.html template to make it easier to integrate OpenGeo Suite SDK apps in GeoNode
Merge pull request #817 from bartvde/sdk_files

add map_sdk.js and sdk_header.html template to make it easier to integra...
get rid of ext in documents upload
check if the file exists before putting the url (mostly for tests)
Merge branch 'master' of github.com:GeoNode/geonode