[RFC] Added extra data to json output

[leevigraham]

• Scenario File / Line Number
• Step File / Line Number
• Step Snippet

Todo:

• Update .features
• Update schema

[headrevision]

@leevigraham Good idea. Could you adapt the JSON schema and add two or more scenarios for it?

[leevigraham]

@headrevision I had a bit more of a play with this and I think it could work. My concern is that the HTML formatter doesn't use hooks but a printer which allows access to the Background etc.

Also given Behat v3 is around the corner is this update worth it?

[stof]

These formatters are for Behat 2, so I don't think it is worth it

[stof]

Thus, the existing way is much more flexible as it allows setting the parameters later (assuming the service provider is written properly, i.e. reading parameters at the time of building services, not at the time of registering them) instead of requiring all configuration to be done at the time of registering the provider

[headrevision]

Indeed, these formatters are not yet updated to Behat 3, see #6.

@leevigraham Anyway, feel free to finish this PR if you need those extensions to the JSON. If not, I agree with @stof.