Version 1.1pre8 released.

• ExperimentalProtocol is now enabled by default.
• Added an invitation protocol that makes it easy to invite new nodes.
• Added the LocalDiscoveryAddress option to change the broadcast address used to find local nodes.
• Limit the rate of incoming meta-connections.
• Many small bug fixes and code cleanups.

Thanks to Etienne Dechamps and Sven-Haegar Koch for their contributions to this version of tinc.