[AC-2305] MobileWeb: Picker "add" method is dead slow

*Problem description* When I'm trying to call:

Titanium.UI.Picker.add(Titanium.UI.PickerRow[])

With a list of my simple items I got these results on FireFox 18 with Core i5 3.2GHz: Adding 50 rows time: 1.045seconds Adding 100 rows time: 4.017seconds Adding 200 rows time: 19.738seconds On mobile devices it's much much slower... *Workaround* 1. Add new method to PickerColumn to add list of columns at once. (or add this ability to "add" method) 2. Add new method to PickerRow to add list of rows at once. (or add this ability to "add" method) 3, Use this methods in \Ti\UI\Picker.js "add" function instead this part

if (is(value,"Array")) {for (var i in value) {this.add(value[i]);}}