Make PR for orbitdb.

[btimby]

This seems like a useful function:

https://github.com/btimby/nimtok/blob/23c21a2983d3da491bf4521a9c16cee5ea22b514/src/plugins/orbitdb.js#L52

It is necessary because:

• you can open() a database, which will create it, but options are not accepted.
• you can create() a database, but if it exists an error is thrown, unless overwrite is enabled.
• there is not currently a way to create() a database (with options) or open() it if it exists.

The above are my observations. The API docs do not show that options are passed to open() or any of the db specific functions like keyvalue().

This could be implemented a couple ways.

1. Like I have done here.
2. Or by adding options to open() and db specific functions like keyvalue().