Changed kx.iterator.each() implementation to follow the Array.forEach() spec more closely
Refactored all internal methods using kx.iterator.each()
Merge pull request #1 from pauldenotter/master

Changed kx.iterator.each() implementation
iterator performance, documentation
kxIterator
* the default scope of find, map and filter is no longer the iterator object, but can now be provided (ensure compatibility with the native implementation)
* find, map and filter now use the native implementation of these methods if it is available (this is almost 3 times faster)