Missing support for json input files

[gicao]

Is it possible to add support for json input?
The script writer could refer to fields in the json input using json-path like syntax.

[benhoyt]

Closing as this is a duplicate of #152 -- this is something I'd like to do, but need to find time to spec it out fully and then implement it. Feel free to comment there if you have specifics to add to the discussion. Thanks!