Quadstore and the new level packages

[jacoscaz]

Hi Leveljs community! I've recently upgraded https://github.com/belayeng/quadstore, an RDF graph database, to the latest generation of level packages and the experience definitely deserves a shout out. To all the committers and maintainers of these packages, THANK YOU for the hard work. The new packages are awesome. Not having to depend on stream/readable-stream and the Buffer class is particularly terrific. Embedded types are also a lot nicer to work with.

Great job!