1. Consolidated logic for display of topic images.
2. Fixed issues with selection of decoders when the child schema is selected.
3. Added logic for automatic selection of a default topic for the Publish view
Merge branch 'master' into scala_2.11

* master:
  1. Consolidated logic for display of topic images. 2. Fixed issues with selection of decoders when the child schema is selected. 3. Added logic for automatic selection of a default topic for the Publish view