CocoMUD client

CocoMUD crashes very nastily when it opens and no Internet connection is available. This also happens if one selects a server and cannot connect to it. The former bug is due to the fact that CocoMUD tries to obtain its updating information from cocomud.plan.io and fails to reach it, which entails a fatal error. This error should be handled more smoothly, and there should be a dialog appearing to warn the user the updater isn't available. Although unlikely, keep in mind plan.io might be inaccessible for other reasons.