proxy: add vendor module proxying-agent
proxy: add ssl proxy support
redis: connection mock broke under latest redis
config: HSM env var should be coerced to a boolean value

This is causing a collector error since the collector expects a boolean
value and instead gets a string value. The end result is the connect
method always fails if high security mode env var is set to true.
stream-sink: Explicitly ensure we release TLS slab buffer regions
cassandra: add support for node-cassandra-cql
cassandra: basic cassandra support
proxy: general release of proxy support
docs: updated for new version
release: published 1.8.0
metrics: detect x-queue-start header, and discover units

Detect either x-queue-start or x-request-start headers,
and convert units to ms from s, ns, us, or ms
metrics: display queue times in UI
docs: update docs for release
release: published 1.8.1
api: feature flagged stab at custom segments
node-cassandra-cql: changed to using Client obj and prototype methods for wrapping
nginx queue timing headers sends t=${time}
docs: update for proxy
docs: updated for new version
release: published 1.9.0