Sensor Registration, document uploads, etc

[ksonda]

I have used the docker containers to run the starterkit on an Ubuntu 16.04 LTS machine with 16GB RAM, 50GB disk, 1 quad-core CPU, following the directions given to me by @oggioniale in #212

Whether logged in as admin or as a registered user,

I am unable to register sensors, receiving this error

I am also unable to successfully upload any documents.