Made the sortable collection remove links more stable by using dynamically bound onClick handlers (with a closure containing the element the remove button was generated for) instead of deletion based on structure (e.g. parent().parent().remove())

Fixed css alignment of nested dynamic collections.
Improved the selectOrAdd widget. Found a bug in bootstrap extra modals.

Bug: Removing a form element in chrome.
https://github.com/jschr/bootstrap-modal/issues/92

Widget improvements.
- modal is not found √ (wrong return in createModal)
- modal doesn't close on submit √ (suppress redirect on submit)
- modal has a submit and an o.k. button √ (modified template)
- headline is not translated √ (modified template)
- misplacement, centers on second open √ (modal content was not yet loaded on launch)
Added searchable support to the selectOrAdd type (pass "searchable" => true in the form builders).
This makes use of the select2 plugin (http://ivaynberg.github.com/select2/), which provides e.g. typeahead filtering of select boxes.