hubotio/hubot

fix: address deprecation warning on startup

The `body-parser` deprecation warning on startup is due to `express.urlencode()`
requiring an `extended` property in the options argument in Express 4.x.

Fixes: #1476

Brain: avoid retaining dangerous robot/brain references

Add a new persistence model - Datastore

Dependency updates

The Datastore class provides a persistent, database-backed key-value
data storage class. This complements the existing Brain class in a few
ways:

1. Each get/set operation is directly backed by the backing database,
   allowing multiple Hubot instances to share cooperative access to
   data simultaneously;
2. get/set operations are asynchronous, mapping well to the async
   access methods used by many database adapters.

chore(package): Upgrade nyc to the 13.x series

Brain: ensure User objects are actually User objects

chore(package): Move coffee-scirpt to coffeescript

docs(src/robot.js): add comment for alias

Fix spelling

Adapter docs: document ES2015 entry point

The default Hubot require entrypoint is only compatible with
CoffeeScript. A separate entrypoint has to be used when writing ES2015
classes.

Chore: Publish to default tag instead of next