Issue #1: Initial implementation for MQTT operators in Java.
Issue #14: Fix namespace for MQTT operators, fix serverUri parameter to
serverURI to maintain source compatibility with existing operators.
issue #14:  Attempt #2 to fix namespace name
Test Revert - added some comments
Revert "Test Revert - added some comments"

This reverts commit aeceb79f85c8bab9f7f889afceec443fe6fc211e.
Clean up - renamed operators to MQTTSource and MQTTSink to match
existing names.
Clean up - removed temp file
Issue #15 - Added retain parameter for MQTTSink operator
Qos parameter should be optional - fixed
Merge branch 'master' of github.com:IBMStreams/streamsx.messaging
Fixed up default for qos
Revert "Fixed up default for qos"

This reverts commit 3e3f59641c7868e477c92142f850bd10678a6a93.
Merge branch 'master' of github.com:IBMStreams/streamsx.messaging
moved Kafka functionality to a separate client class. added samples