Specifically, Users.users, Users.connections, and Users.pastUsers
are now ES6 Maps. In theory, this should be a minor performance
upgrade, but we still need to profile to make sure.
- Streams are merged to make sure that all errors and warnings are reported.
- Adds dev dependencies: `merge-stream` and `lazypipe`.
- Tracks a fork of `gulp-jshint` to fix https://github.com/spalger/gulp-jshint/issues/88