Migration to Express 3.x

Changes to support Express 3.x
https://github.com/visionmedia/express/wiki/Migrating-from-2.x-to-3.x

Info about some common isuues with serialport
https://github.com/voodootikigod/node-serialport/issues/69
https://github.com/bigkevmcd/node-rfxcom/issues/1
https://github.com/voodootikigod/node-serialport/issues/81