bug correction
prepare multiple boards (rooms)
Replace jscolor by a homemade color picker.
It is called canvascolor, and it's based on HTML5 canvas (we don't care, we don't target old browsers).
Advantages over jscolor:
 - has color history (previously choosed colors are displayed)
 - more beautiful
 - way smaller ~1KB when minified and gzipped. (It's not gzipped yet)
 - Works on fixed input elements (CSS position:fixed)
However:
 - Not every color can be choosen graphically. In HSV, only colors with S=1 are displayed.
 - Not tested on mobile (but it should work), not responsive to touch events.