move to a manual tarball of statsd, as github dynamic tgz gen seems broken, prevents npm install from working

upgrade to a branch of statsd that lazily closes ephemeral UDP ports, so that we're not allocating one UDP socket per request when under load.  closes #680

fix regression in keysigner - ensure non-default VAR_PATH is relayed to compute processes - issue #213

improve node.js version checking.  eliminate DRY violation, and use semver for robust version specification and matching.  nice yak, eh?

express our dependency on nodejs >= 0.6.3 in package.json and in code.  (note: I'm not sure package.json actually does anything useful, but it's a good place to document it)c

store public key on disk as a certificate which has embedded creation time.  use that as the value returned in /wsapi/session_context as domain_key_creation_time - now you can update keys at any time and outstanding client certs are expired automatically - closes #599

update jwcrypto, now issued_at is part of certificate.  in frontend code compare server time, issued_at, and domain_key_creation_time to determine if a cert has expired.  (previously, clock skew could cause certs to be regened every single time.  hawt.) issue #599

repairing load_gen - issue #504 - update pathing, alter fake_verification WSAPI to query the database rather than to use email interception (which no longer works)

implement graceful process shutdown, and clear logging as to the reason why processes are terminating.  include winston handling of uncaught exceptions.  this all goes into a library that all of our processes use.  closes #529

implement graceful process shutdown, and clear logging as to the reason why processes are terminating.  include winston handling of uncaught exceptions.  this all goes into a library that all of our processes use.  closes #529

bump to postprocess 0.0.3 - fixes issues in postprocessing certain types of responses (where a string is sent() instead of a buffer as the first chunk)

update to bcrypt v. 0.4.0 which includes .get_rounds and lets us perform on-the-fly work factor update.  issue #204

move off of lloyd's fork of connect-cookie-session and back onto upstream version 0.0.2 - issue #310