Bring OSS Zipkin into internal repo

RB_ID=311737
initial pants integration for zipkin

RB_ID=312811
move all zipkin servers to pants

RB_ID=314101
move analytics projects to pants

RB_ID=315945
fix development of web

RB_ID=314831
Pants build for collector; fixed pants goal list.

RB_ID=317107
fix static content caching

RB_ID=319905
zipkin: Scripts to build and deploy with jenkins.

Scripts for cassie and MH collectors, web, query, scribe-proxy.

RB_ID=318857
zipkin: Fix service discrovery in zipkin-scribe-proxy.

RB_ID=322031
zipkin: Fix tests.

(This CR includes https://github.com/twitter/zipkin/pull/367)

RB_ID=324829
zipkin: Switch query to Manhattan storage

RB_ID=326705
zipkin: Translate Manhattan failures into Future.exceptions.

RB_ID=330239
 zipkin: memcache store and new query API for realtime read path
 This is for zipkin-realtime read path. It includes two main components.
 - memcacheRealtimeAggregatesStore
 - query side API for the realtime aggregates.

RB_ID=329605
Oss sync

Sync the OSS repo back to internal.

RB_ID=334257
Oss sync

RB_ID=335215
serially adding binary annotations to a span do not clobber each other

Signed-off-by: Jeff Smick <jeff@twitter.com>

RB_ID=335335
sync oss