Stub out pkgcloud integration.
More configurables, finish client handshake.
Take the given container as arg
Document docker run
Retrieve the actual container.
Callback soup
Append png to path
Define `cdnUrl` on demand during the first render.
Respond back to client in advance of process fin
Send on the cdnUrl
Decode for the sake of Swift/CloudFiles
Destroy the global accident.
Cross items off the checklist
Merge pull request #1 from jupyter/pkgcloud

Pkgcloud integration