Allow Debug filters to print an identifier
Add MockTridentTuple for building tests.
Drop use of Guava
repeat defined taskId?

unnecessary (task-id (:task-id task-data))
Merge pull request #407 from shell0dh/master

 repeat defined taskId ?
add multischeme.
add SchemeAsMultiScheme
remove twitter copyright
Merge pull request #413 from sritchie/multischeme

MultiScheme Interface
update readme/changelog
Merge pull request #398 from emblem/mock_tuple

Add MockTridentTuple for building tests.
Merge pull request #382 from emblem/named_debug

Allow Debug filters to print an identifier
update changelog/contributors
add IMetricsContext so State's can keep metrics
make TridentOperationContext implement IMetricsContext
added error checking when creating combolist
use ZMQ/NOBLOCK when sending messages. this fixes #420
update changelog
error checking on ComboList, and fix bug in Aggregator so that it sets the correct group during aggregate
update changelog