A Riemann Client for Haskell

Nothing too fancy here yet. I might call this Zeta as well if it's not too confusing with previous designs at https://github.com/reifyhealth/zeta.

Todos

Batched event transmissions
- Using a worker thread
- Using an efficient builder
Msg delivery over TCP
RiemannT API design
- Unified API for UDP/asynch/cheap messages versus TCP/synch/guaranteed messages
Background thread deliving RTS events to a client
Better tests and documentation
Eliminate the lens dependency (perhaps?)
Query language support (see branch dev-queries)
- Parser/PrettyPrinter combination to form an iso on the HasQuery class