v2.0.9

Maintained fork of cottz:publish-relations
by lfades (MIT).

This bugfix release fixes the long-standing oplog error from this.join():

The Mongo server and the Meteor query disagree on how many documents match your query

Fixes

• Stop leaked join observers — when a join cursor was re-issued with a new
  selector, the previous observeChanges handler was overwritten without being
  stopped, leaving a stale observer running against an older $in selector. It
  is now stopped before being replaced.
• Shrink the join $in on contributor removal — joined ids were only ever
  added, never released, so the $in grew without bound on long-lived / busy
  subscriptions and eventually diverged from Mongo during oplog reconciliation.
  The $in is now refcounted per joined id and shrinks when contributor
  documents are removed (dropped documents are explicitly retracted from the
  client), while staying fully reactive.

Fully backwards compatible with cottz:publish-relations — same API.