Block chain download improvements.
Block chain download improvements.

Improved timeout handling.
Better queue handling.
Better debug messages.

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