JSON-LD in pygments

A PR I put in a while ago finally got merged into pygments mainline:

https://bitbucket.org/birkenfeld/pygments-main/commits/d93e0c28a22a4a5980990f33b389f134fb6df1d2

(manual merge, as it was getting really behind, and I'm really bad at
mercurial)

Not sure when the release will be cut, but that's codemirror and pygments,
which is a pretty good start for browser-based tooling, i.e. IPython
notebook, playground, etc. Looking forward to more tools being able to use
it!

cheers,
Nick