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
Kill the menu, scroll to last image.
Scroll via offset, scrollTop
clip rect attempt
Double whammy scroll.
Just scrollIntoView
Merge pull request #2 from jupyter/heuristics

Kill the menu, scroll to last image.