Arduino support

+ Created node backend with socket.io
+ Added johnny-five lib to handle communication between node and arduino
+ Moved index.html file, audio/ dir, and fonts/ dir to public dir and
public/ is now in version control, except css and js dirs
Pretty nice.

+ Added Tempo class to control bpm adjustment via the ui
+ Updated css bits
+ Made knobs that turn
+ Arduino-controlled, yay!
Merge pull request #4 from tranzfuse/nodeserver

Nodeserver