Laying groundwork (plus an example) of Tangelo/VTKWeb.
Added command line option to specify list/range of ports to use for VTK Web processes.
Infrastructure in place for allocating/deallocating ports to VTK Web processes.  POST and DELETE have stub code logic.
vtkweb-launcher.py script now works from command line for vtk tree example.
Set vtkweb launcher script up in CMakeLists.
REST API for vtkweb process creation/deletion/reporting works.
Phylotree app demo works.
Dynamic websockets work now.
VTK Web processing works, including websocket proxying etc.
Made key argument a path component instead of query argument in vtkweb REST service.
Trying to add second vtkweb example.
Fixed cone example.
Removed some vtkweb logging statements.
Better log message when vtkweb process starts.
Waiting until process is shut down, so we don't have to remove the PID file by hand (this is taken care of by the PIDFile cherrypy plugin).
Renaming tree files to make room for index.html with unified demo.
Adding generic vtkweb controller example.
Extended GET action on vtkweb REST API to show all existing keys.
Fixed bug in vtkweb ws url transmission.
Redid how URL is computed and sent to client - works correctly now.