Added Dogecoin main and testnet genesis block configurations.
Merge pull request #84 from rnicoll/master-dogecoin-genesis

Add Dogecoin genesis block configurations
Update README.md
Merge pull request #87 from leishman/master

Update README.md
Switch bitcoin-ruby back to lian now that it has the Litecoin fixes merged in.
Fix reorg handling
Oops
Fix block header index pruning
Increase regtest timeout