add source processors

* added new processor types:
    - kinesis
    - rabbitmq
    - redis
    - sqs
    - websocket
* added dependencies:
    - com.rabbitmq:amqp-client
    - redis.clients:jedis
    - org.apache.commons:commons-pool2 (transitive)
* dry up:
    - processor type creation from json config
    - extract KinesisShardPoller and use in proc
    - extract WebsocketClientLoop and use in proc
* get rid of sink processors, not needed yet
* add com.logscale.engine.proc package
Merge pull request #3 from logscale/add_source_processors

support new stream sources