v0.2.0

• Default listen port changed to 9216.
• All log messages now go to stderr. Logging flags changed.
• Fewer messages on default INFO logging level.
• Use https://github.com/prometheus/common log for logging instead of https://github.com/golang/glog.
• Use https://github.com/prometheus/common version to build with version information.
• Use https://github.com/prometheus/promu for building.