Expose EndpointContext as angular-service
Expose EndpointContext as angular-service

This allows us to override serializers, albeit in the run-phase of the
application. We might want to expose some specific serialization-config
as an object that is available during the config-phase. It doesn't
matter much though and works for the moment.

Closes #3.

EvidentSolutions/apina,EvidentSolutions/apina,EvidentSolutions/apina