Expose recover method

[RobDickinson]

Inner node rebalancing is not yet implemented, so is there a temporary workaround that could be made available? One idea is to expose the initial recovery method so that the inner nodes could be periodically rebuilt, but this is basically the same as closing and re-opening the database. Is there a cleaner way to handle this until rebalancing is automatic?

[RobDickinson]

Going to stick with creating/destroying the instance as a way to reopen rather than exposing a method for doing so on a live instance. It's more important to fix issues like #30 in the short term.