0.9.0

• Improved: stack.sh start and stack.sh stop can now start/stop a single container

• Improved: the instance:list command now returns database vendor and version for each defined db instance.
  NB: the database version is gotten from querying the databases themselves, rather than relying on configuration (unlike the data shown in the web interface, which still relies on the values manually set in config files)

• Improved: the collation:list, database:list and user:list commands now return a more structured output, which is better for non-text output formats such as json

• Improved: lots of refactoring under the hood, laying the groundwork for more functionality in the future