Usage:
Upward Loop Function
up( 0, 10, 1, function(i) {
// Do something
}, function() {
// callback
});
Downward Loop Function
down( 10, 1, 2, function(i) {
// Do something
}, function() {
// callback
});
forEach Loop Function
forEach( Array, function(k, v) {
// Do something
}, function() {
// callback
});