Add release doc, changelog

Author: @franklinhu
Fixes #82
URL: #82

CHANGELOG

@@ -0,0 +1,22 @@
+# 0.2.0
+* Collector
+  * Refactor scrooge specific code to zipkin-scrooge
+  * Refactor Scribe specific code to zipkin-scribe
+  * Add top annotations storage endpoints
+* Hadoop
+  * Add job runner
+  * Add expensive endpoints job
+  * Add whale report
+* Query
+  * Add top annotations query endpoints
+* Web
+  * Add Scala UI (zipkin-finatra), not entirely stable yet. Rails UI
+    (zipkin-web) is deprecated and will be removed in the next release.
+  * Add static trace rendering page
+  * Add top annotations suggestions on search page
+  * Add link to static search page
+* Misc
+  * Refactor many shared classes from zipkin-server to zipkin-common
+    for reuse in zipkin-finatra
+  * Add startup scripts
+

RELEASE

@@ -0,0 +1,12 @@
+# Steps for releasing
+* Update the changelog on master
+* Cut the release branch         - git checkout -b 0.2.x
+  * bump to stable               - bin/sbt version-to-stable
+  * package the jars             - bin/sbt package-dist
+  * tag                          - git tag 0.2.0
+  * bump the patch version       - bin/sbt version-bump-patch
+  * bump to SNAPSHOT             - bin/sbt version-to-snapshot
+  * commit                       - git commit && git push
+* Back on master                 - git checkout master
+  * bump the minor/major version - bin/sbt version-bump-minor
+