16.5

• Added VisualizationEvent (thanks @BillyGalbreath)
• Added DeniedMessageEvent
• Fixed a bug that could cause the server to hang

If this version is causing crashes, please paste your entire server log (via a service such as http://gist.github.com) including steps to reproduce here: #66

If you cannot reproduce the issue, simply downgrade to 16.4 in the meantime.