Improved log messages for block download after initial chain download.
Improved log messages for block download after initial chain download.

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