v0.5.6

v0.5.6

• Added support for gunicorn.
  Gunicorn may be used to manage API processes with the --production or --gunicorn flags. The --production flag is not default in the Docker image of the API server.
• Updated bootstrap pipes flow.
  The interactive bootstrapping wizard now makes use of the new register() plugins API as well as asking for the value column.
• Fixed edge cases in Pipe.filter_existing().
  Better enforcement of NaT as well as --begin and --end now reduces edge-case bugs and unexpected behavior.
• Re-introduced the full Docker image.
  Inclusion of the start gui command led to the full version of the Docker image requiring GTK and dependencies. Now you can forward the GUI with docker run -e DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix bmeares/meerschaum:full start gui
• Fixed plugin installation bug (again).
• Allow for plugins with hyphens in the name.
• Lots of refactoring and tiny bugfixes.