Fixing helenus at 0.6.2 till boolean values can be passed in.
Fix intermittent unit test failure when 2 comments collide
Using messageboxId to lock timestamp if it is a top level comment.
Merge branch 'leafTest-squashed'

* leafTest-squashed:
  Using messageboxId to lock timestamp if it is a top level comment.
  Fix intermittent unit test failure when 2 comments collide
Fixed up _lockUniqueTimestamp and added @private in its JSDoc.