Updated kit/tracing readme's and removed deprecated kit/tracing/zipkin package#275

Merged

basvanbeek merged 2 commits intogo-kit:masterfrom basvanbeek:master

May 26, 2016

+164-17,350

Commits on May 26, 2016

Updated tracing readme's and removed deprecated tracing/zipkin package
basvanbeek
committed
updated tracing/zipkin readme to better clarify span per node vs. span per rpc
basvanbeek
committed