added a document on collection api
Merge pull request #256 from twitter/collection-api-doc

added a document on collection api
backticked code
Merge branch 'collection-api-doc'
Refactor Json Classes
This is a first step with no removal of existing functionality, but it makes it much easier to start removing the Json object conversions.
The main architectural change is to use a Jackson generator object to do the type conversion instead of scala type-pimping and the .toJson method.
Adds the Zipkin browser extension, which visualizes traces in the browser. If you
go to any page on your website that is traced by Zipkin, you should be able to
see traces for each HTTP request in a new Firebug panel.

Author: @IceCreamYou
Fixes #258
URL: https://github.com/twitter/zipkin/pull/258
support new ca/sa binary annotations

Author: @bmdhacks
Fixes #259
URL: https://github.com/twitter/zipkin/pull/259
Fix preference default in new browser extension
Add redis to TravisCI services

Add redis to required TravisCI services since tests depend on it

Author: @franklinhu
Fixes #263
URL: https://github.com/twitter/zipkin/pull/263
Added an indicator of duration to the Firefox extension visualizations

Added an indicator of how long each request took to
process. I did it in the easiest possible way. It would probably be better to
adjust all visualizations to have relative scale, so that for example a 1ms
request would look small next to a 100ms request, but really doing that right
would take a disproportionate amount of time.

Author: @IceCreamYou
Fixes #261
URL: https://github.com/twitter/zipkin/pull/261
Fixing Build Properties Generation
For whatever reason sbt does not want to change the resourceGenerators inside
of the BuildProperties plugin, so I just do it in each project I need it in.
Merge branch 'master' of github.com:twitter/zipkin
Zookeeper Fixes
Our recent changes to bind to 0.0.0.0 was causing the scribe collector to publish an incorrect address in zookeeper.

Author: @bmdhacks
Fixes #265
URL: https://github.com/twitter/zipkin/pull/265
Added better support for Redis.

Fixed a bug in
zipkin-redis:com.twitter.zipkin.storage.redis.RedisSortedSetMap where a
Either[Future[ZRangeResults], Future[Seq[ChannelBuffer]]] was being returned instead of
a Future[ZRangeResults]. The method in question will always return a
ZRangeResult because it is getting a sorted map, so we simply get the
left item of the Either.

Added bin/collector-redis and bin/query-redis for easier
setup of the collector and querier with redis support.

Added zipkin-redis/config with the scribe configuration files for a
sample client and server. These are simply example files.