class support

[mictadlo]

Hello,
any plans to support class in DART:
class Point {
Point(this.x, this.y);
distanceTo(Point other) {
var dx = x - other.x;
var dy = y - other.y;
return Math.sqrt(dx * dx + dy * dy);
}
var x, y;
}

main() {
Point p = new Point(2, 3);
Point q = new Point(3, 4);
print('distance from p to q = ${p.distanceTo(q)}');
}

[nikomatsakis]

Our plans regarding classes are described in #1726