Made the data_form argument optional if you 1) don't have a form available or 2) don't want the form to be reset when adding an item.
Fixed AJAX uploading in Internet Explorer 8. Optimized the algorithm for serializing <form> to urlencoded query.
Updated html5shiv to version 3.6.2. This fixes innerHTML issues in IE8.
The modern XMLHttpRequest is now tested before the old ActiveXObject in AJAX. This makes File Uploading work in IE10.