Switch database key assignment from one-up index to a string hash of the pipeline being stored.
Require web users to specify the ID of a pipeline in the database as a URL parameter.
Seperate PUT functionality from get-points.  Move set-stuff-up functionality into Vagrant's provisioning, which will eventually launch Greyhound completely on 'vagrant up' and stamp down a sample pipeline in the database.  Temporarily: Check out hexer to a well-known revision, and remove pgpointcloud from build.
Temporarily switch to a fork of hexer that builds for Ubuntu pending resolution of an issue.