Update README.markdown
Only warn once about waiting for mysql port.
Update README.markdown
Merge pull request #90 from youtube/healthcheck

Only warn once about waiting for mysql port.
Rename .markdown to .md and move Contributing.md

The prevailing convention on GitHub seems to be .md

Also by moving CONTRIBUTING.md to the root, GitHub will automatically
link to it when someone tries to contribute:

https://github.com/blog/1184-contributing-guidelines
Merge pull request #91 from youtube/markdown

Rename .markdown to .md and move Contributing.md
Simplify instructions for contributing and deprecate createcl.
Merge pull request #92 from youtube/contributing

Simplify instructions for contributing and deprecate createcl.
Pin our docker image on wheezy.

The golang image we base on has moved on to jessie, which breaks our
build.
Merge pull request #93 from youtube/docker

Pin our docker image on wheezy.
Lowercase shards for ResilientSrvTopoServer.GetEndPoints.

This prevents using duplicative cache entries and counters for
essentially the same value.
Merge pull request #94 from plobsing/resilient-topo-srv

Lowercase shards for ResilientSrvTopoServer.GetEndPoints.