1.0-beta.21

For folks that are interested, this is our internal milestone release, known as "Drop 2".

• Significantly improved Pacemaker algorithm that will allow the system to recover from serious outages and netsplits that our basic initial pacemaker implementation did not allow for
• Proof-of-stake implementation including:
  -- validator registration and unregistration,
  -- staking and unstaking, and
  -- validator selection
• Fee implementation that covers the use cases we will need for mainnet launch
• Implemented quorum timestamps that will be used to implement epoch length control in Drop 3
• Significant work on our syncing sub-system, particularly in dealing with edge cases
• A crash recovery system that allows nodes to restart on crashes and synchronise with the network
• Continued work on our integration testing sub-system