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Pull #236

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Review markups

This commit makes some changes requested in the [pull request][1].
Namely:

  - provide the base class of `MilestoneDB` to `Backend` by default to
    be super-clear that no milestones will be saved by default
  - making all callbacks call asynchronously using
	[`process.nextTick`][2]
  - cosmetic changes

[1]: https://github.com/share/sharedb/pull/236
[2]: https://jsblog.insiderattack.net/event-loop-best-practices-nodejs-event-loop-part-5-e29b2b50bfe2

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