INTEXT-77 Add Kafka topic filter support for producer + consumer

* Add tests
* Add samples
* Update readme

Jira: https://jira.springsource.org/browse/INTEXT-77
Merge pull request #58 from relango/merge-master-kafka-topic-filter

* relango-merge-master-kafka-topic-filter:
  INTEXT-77 Add Kafka topic filter support for producer + consumer
INTEXT-92 Kafka: Add support for specifying any producer/consumer property

* Update README.md for producer and consumer properties usage
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