Merge branch 'develop'

Implements a new server/client that rests on top of the main DIQS
database/query engine. It's currently based on a single-threaded
select() model for network connections, which means that operations
to the server will block. Work might be put in later to make
these operations async, but for now it's fast enough for just a
couple of clients to work with.
Merge branch 'develop'
Removed unused submodules & updated msgpack-d
Update README and remove dead Makefile portions