Updates to zipkin-java 0.4.1, particularly docker images

Zipkin 0.4.1 obviates some duplication of configuration. It is also the
first version that's published as a docker image.

By switching to the published image of zipkin-java, we can be more
consistent, as `spring-cloud-sleuth-zipkin-stream` is derived from that,
not the scala query service.

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-zipkin/docker-compose.yml

@@ -3,16 +3,16 @@ mysql:
   ports:
     - 3306:3306
 query:
-  image: openzipkin/zipkin-query:1.30.0
+  image: openzipkin/zipkin-java:0.4.1
   environment:
     # Remove TRANSPORT_TYPE to disable tracing
     - TRANSPORT_TYPE=http
     - STORAGE_TYPE=mysql
+    # - JAVA_OPTS=your jvm params here
   expose:
     - 9411
   ports:
     - 9411:9411
-    - 9901:9901
   links:
     - mysql:storage
 web: