Allow passing bytesio object as json/yaml config

[spwoodcock]

Fixes #3

Also:

• Fixed minor bug with parseJson.
• Added docker compose setup for tests with a database.
• Fix minor bug calling dbshell.close() when does not exist.
• Improved queryRemote:
  • Reduced initial polling to 2 seconds.
  • Update to 10 second polling after a minute passes.
  • After 10 minutes pass, abort the polling and return None.
• Added extra tests.