Version 0.4.0

New feature release with some API changes (read at the bottom) which will
hopefully stop being a thing once we hit 1.0

Features

• Adding a main /driverlist endpoint to match clusto.driverlist
• Added support for extra server adapter options in config
• Better test cases for resource manager core application
• Support for pool removal with caveats, read below for changes

API Changes

• Pool insertion changed from a PUT to a generic POST action, briefly: PUT
  for .insert() didn't make much sense without support for .remove()
  but .remove() isn't properly a DELETE action. Ergo we changed it to
  be a generic POST to the endpoint with an action=[insert,remove] field