fshost

// extend one object with another object's property's (default is deep extend)
// this works with circular references and is faster than other deep extend methods
// http://jsperf.com/comparing-custom-deep-extend-to-jquery-deep-extend/2
function extend(target, source, shallow) {
    var array = '[object Array]',
        object = '[object Object]',
        targetMeta, sourceMeta,
        setMeta = function (value) {
            var meta,
              jclass = {}.toString.call(value);