removed default topic selection
moved Kafka replica info to Observe::Replicas (from the Inspect tab)
bumped the revision to 0.18.6
Merge branch 'feature/webui' into scala_2.11

* feature/webui:
  bumped the revision to 0.18.6
  moved Kafka replica info to Observe::Replicas (from the Inspect tab)
  removed default topic selection