v0.1.6

#7 new API: completed implementation of mongo style filters
#11 new API: queue device.
#12: new API: simple JSON mapper (simpler but less powerful than JSON transform)
#14: new API: reader.tee
#10 bugfix: mongodb upsert was not waiting for completion callback.
#13: bugfix (serious): errors could cause transform to hang.

streamline dependency has been bumped to 0.10.15.

You are strongly encouraged to upgrade, because of #13 bugfix.