removed debugging code to clear database
validate requests using jsonschema
fix url
more tolerant file extension check
configurable registratio
fix tracker url
user trackers
added license checks and docs
simplified validation of json data

by not storing the json schemata relative to OPENSHIFT_REPO_DIR, wsgi
dispatching gets easier
moved mongodb default configuration into source

again, simplifies wsgi dispatching
cosmetics
replaced OpenID by HTTP Basic Auth

OpenID is not really broadly used. The new mechanism is weaker in the
sense that the identity is less strictly established (no check if email
address exists, ...), but simpler to use.
separated 3d view data storage from rendering
sanitize thing properties that get served