1.0.0

This is a fairly major overhaul of the internals of the switchboard while maintaining compatibility with the behaviour of the switchboard as it was in the 0.x releases.

There are a few things to be aware of with this release:

• switchboard.sparks is now switchboard.peers but still remains as a collections/fast-map

• The function signature for handlers has changed to match the following:

  function(mgr, spark, parts, primus, opts) {
  }

• The switchboard is now an instance of mbus rather than an EventEmitter.