Remove extra unnecessary maybeThenable check
Extract promise cycle handler to function so stack traces make sense
Rebuild es6 shim
Minor improvements to monitoring
Dont capture pending in keys.all
Filter out duplicate stack lines across stack jumps. Expose observed property on RejectedHandler in all cases.  Could be useful during debugging.
Explicitly discourage the use of when.defer, and point people at alternatives.  Re-add simple docs for deferred.resolve/reject/notify
Bump version 3.0.1
Rebuild es6 shim. Add changelog for 3.0.1