2.3.0

• Add a timeout configuration to HttpProxy views allowing
  configuration of how quickly HttpProxy views give up on slow upstream
  responses.
• Add a cert configuration option to HttpProxy views.
• Update generate_routes and generate_proxy to support new
  configuration options.
• Documentation updates.
• Correct a development environment issue with six: a version that was
  too low was specified in requirements.txt which caused test failures
  in certain cases.