* dependency injection for the kafka consumers/producers

* Optionally use naffka in the monolithic server

* remember to call setupKafka()

* tweak imports

* fix integration tests

* Add use_naffka to the example config

* Update comment on the listen APIs

* Profile retrieval

* Saving avatar (without propagating it)

* Saving display name (without propagating it)

* Getters for display name and avatar URL

* Doc'd

* Introduced new Kafka topic and producer

* Updated config with new kafka topic

* Switched to samara producer and now sending messages

* Doc'd

* Put kafka update after the database insert

* Doc'd profileUpdate structure

* Removed unused parameter

* Moved user updates producer to clientapi/producers