Add travis-based integration tests

allow access to containers for all users

Add 'public' as a propagated property for projects

Sensitive data like subject firstname and lastname will be left off.
Also file contents won't be available.

Closes #196

Fix Mimetype Error

For when the mimetype of a file we are serving is unknown

catch Exceptions in method dispatch in api.py

Avatar improvements

closes #59

Improve 401 Error Logging

add advanced datatree search query

Add origin tracking to files

Serve schemas