Echo JS 0.11.0

Well, faster on chrome, slower on firefox.

Faster an equally effective:

Array.prototype.shuffle2 = function (){
    var r = [];
    var l = this.length, i;
    if ( l == 0 ) return;
    for (i = 0; i < l; i++) {
        r[i] = this[i];
    }
    while ( l-- ) {
        this[l] = r.splice(Math.floor(Math.random() * (l + 1)), 1)[0];
    }
};