Changes

* Reward those that contributed the most to a shared project and earned special tokens

A message is "broadcast" if an owner token or channel token is sent in a transaction to the same address with the addition of an IPFS hash and an optional expiration date. The message isn't really broadcast in the sense of being transmitted to nodes, but rather each node will independently detect the special transaction type and display the message. Message display is subject to some heuristic anti-spam rules.