Add dynamicRange option.
Adapt rescaleScene to be able to increase the scale (new note is added) or decrease the scale (a note is deleted).
{
"name": "pianoroll",
"version": "0.0.0",
"dependencies": {
"randomColor": "davidmerfield/randomColor#~0.1.1",
"pixi": "~2.2.3"
}
}