Not every block has version 1. Fixes #50.
Not every block has version 1. Fixes #50.

See block
[42157](http://blockexplorer.com/testnet/rawblock/0000000000a453aba57f9b9261322c9f3762290478eb9fb4adeff270e53751bc)
of testnet.

zhangweis/node-jds,javascriptit/bitcoinjs-server,zhangweis/node-jds,dazoe/bitcoinjs-server,zhangweis/node-jds,bitfloor/bitcoinjs-server,bankonme/bitcoinjs-server,dazoe/bitcoinjs-server,dazoe/bitcoinjs-server,bankonme/bitcoinjs-server,bankonme/bitcoinjs-server,bitfloor/bitcoinjs-server,javascriptit/bitcoinjs-server,javascriptit/bitcoinjs-server