Simplify health checks: get rid of response code list
Use correct range
Merge pull request #260 from mesosphere/health-api-simple

Simplify health checks: get rid of response code list
Fixes #146 - Zookeeper connection errors on start
Formatting fix
Merge pull request #265 from mesosphere/wip-146-zk-robustness

Fixes #146 - Zookeeper connection errors on start
use instance binding
Asynchronously call sys.exit() to avoid deadlock due to the JVM shutdown hooks.