Allow more than one server running on the same node

[elbrujohalcon]

• implement trails:store(atom(), trails()) that acts like trails:store/1 but it let's the caller store more than one server on the same node assigning a different name for each one.
• implement trails:store(atom(), [{cowboy_router:host_match(), trails()}]) that acts like trails:store/2 but it let's the caller store more than one host for the same server.