add request metrics to server-side render, and refactor (#2814)

remove signup bonus calculation

refactor SSR:

- clientside render
- url rewriting
- get state from api

refactor universalRender into client and server fns
(this makes requirements more clear)

add RequestTimer and StatsLoggerClient classes for request timing logging to statsd

new env var: STATSD_IP

note the TODO about tags -- they do not work yet in scalyr / statsd