* Fixes Elasticsearch to have consistent capitalisation everywhere
across the code and UI (except the config file unfortunately).
* Adds basic unit tests for Elastichsearch.
* Adds a Elasticsearch docker image to the Makefile to enable testing
the Elasticsearch feature.
* Unit Tests for model/push_response.go
* Unit tests for security_bulletin.go
* Unit tests for webrtc.go
* Unit tests for model/password_recovery.go
* Add missing headers.
* Unit tests for model/license.go
* Tidy up existing tests.
* Simplify JSON to/from tests.
* Fix gofmt
