Remove Gemfile.lock

This should not have ever been checked in

Signed-off-by: Ruth Byers <rbyers@pivotallabs.com>
Stop registering with the router on shutdown

Previously, registrar sent an unregister message, but continued to heartbeat.
This meant that the unregister didn't have an effect.

Signed-off-by: Ruth Byers <rbyers@pivotallabs.com>