Allow Debug filters to print an identifier
Add MockTridentTuple for building tests.
Drop use of Guava
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
Add whitelist methods to Cluster to allow only a subset of hosts to be revealed as available slots
fix how host names are determining by using INimbus, use blacklisting instead of whitelisting