Add test-embedded-kafka Sample

Also some general README and pom cleanup.

README Polishing

Resolves #37

Polishing - Use Boot Config for Test Consumer

Possible now that https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/pull/137 is merged.

pom.xml

@@ -33,6 +33,7 @@
 		<module>multi-io</module>
 		<module>stream-listener</module>
 		<module>reactive-processor-kafka</module>
+		<module>test-embedded-kafka</module>
 	</modules>
 	<dependencyManagement>
 		<dependencies>