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Initial implementation

This is an initial implementation of ShareDB's [`MilestoneDB`][1]. The
bare bones of `MongoMilestoneDB` connection logic are based on the
[`sharedb-mongo`][2] database adapter.

This adapter is a slight departure from other ShareDB code, as it is
written in ES6. This is because this code is server-side-only, so we
don't need to support legacy browsers and all LTS Node versions support
ES6. The move should ease maintenance and understanding of asynchronous
code through the use of `Promise`s, which the [`mongodb`][3] library
supports out of the box.

This library notably uses v2 of `mongodb` instead of the newer v3. This
is to stay consistent with `sharedb-mongo`, so in theory the same config
(or style of config) can be used in both `sharedb-mongo` and in
`sharedb-milestone-mongo`.

We also introduce usage of [`eslint`][4] instead of [`jshint`][5], which
is used in other projects. `eslint` supports a much, much wider range of
style rules and helps to maintain a uniform coding style.

[1]: share/sharedb#236
[2]: share/sharedb-mongo
[3]: mongodb.github.io/node-mongodb-native
[4]: https://eslint.org/
[5]: http://jshint.com/

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