Instrument number of conns to ws-server.
transport.websockets: fix a bug handling non-channel HTTP reqs.
transport/websockets: Instrumented outbound events

Also discovered a pubsub leak using that instrumentation, and fixed it.
transport.websockets: instrument inbound events.
Basic instrumentation for TCP/UDP servers
Instrumentation for Netty executor queue depth/active threads.
UDP and TCP server latency instrumentation
Add support for vector of events in Librato

The Librato gauge and counter stream have been modified to accept a vectorof
events. This provides the capability to send multiple metrics in a single
http POST.

A test for multiple events in a single :gauge call has been added.
An analgous set of tests for :counter have been added.
Merge pull request #235 from bwong114/librato_vectors

Add support for vector of events in Librato
core instrumentation: fix hostname for events
Websockets HTTP routing: improve error handling

Fixed a bug which caused the HTTP server to throw confusing exceptions
when it couldn't find a requested path.