Some initial framework for POSTing pipelines.
Some setup for a pipeline database.  Pipelines can be POSTed through the websocket-handler to the new db-handler, which has a rough sqlite database in a temporary location.  All error cases are very much works in progress.
Fix typo, remove extraneous print statement.
Add sqlite3 query functionality and get a stored pipeline up to the websocket handler when create is called with a pipeline ID (although currently ignored by the websocket handler).
Pipeline file stored on server prior to creation of a PDAL session.  When creating a PDAL session, the ID of a previously stored pipeline is passed in, from which the corresponding pipeline is queried server side and used to initialize the PDAL session.
Add a bit of error handling and correct some comments.  Web functionality needs to be updated to perform a 'put' prior to beginning operation and to use a pipeline ID.
Switch PDAL session to use point-context.
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.
Add Greyhound convenience launcher 'gh' to start/stop all services.  Make 'vagrant up' automatically start all services and perform a PUT with the sample pipeline, so the web URL works immediately upon 'vagrant up' with no need to SSH into vagrant for anything.  Documentation needs updating.
Update readme documentation.  Add command line arguments to extend C++ example client code.
Get rid of express middleware deprecation warnings.
Make pdal-session.cpp respect startIndex and numPoints for read requests again.