Switches to when 1.8.1 to help resolve process.nextTick errors

We don't need A+ compliant promises
Factory.getNextId now relies on Factory.execute
Fixes erroneous call to self in Team.heartbeat
Tasks.getStatus no longer relies on Task.get
version 0.2.7 release
Merge pull request #19 from brandoncarl/0.2.7

Bug fixes - note that in the end, when 1.8.1 did not resolve pool issues