Add first attempt at JSON-LD example

[BigBlueHat]

Used http://rdf.greggkellogg.net/distiller and a good bit of follow-on tweaking to make it more human friendly.

The inline @context has some humanizing work done using language maps, but there's more that can be tweaked in a final @context to provide even simpler, less repetitive JSON.

Relates to https://github.com/ewilderj/doap/issues/13

[artob]

This is a good start and would be helpful to merge :+1:

[kjetilk]

Thanks a lot, looks good to me!