releaseVersion is needed in etcd.go to print it out in the -version flag.
simple fix, thanks to @fmilo in #coreos
This will generate the version based on git tags. So if it is built directly on a tag it will use the tag name and if it is built off a commit that isn't a tag it will look like: $ curl localhost:7001 0-267-ga39cf1c
Brandon Philips