Proposal to change the fdsnws/station service definition

[ilpint]

The adoption of the JSON format implies its use on the fdsnws/station web service.
We need to consider if and how suggesting an addition to the fdsnws/station definition.
The simplest addition is a new value for the format parameter, but more could come.

[marcelobianchi]

Maybe we should create some milestone and send this discussion for the future?