Issue #584136, add first and last classes in JS rather than PHP to respect reordering by element_sort.

#587342 by jcmarco with some improvements, Tabs Navigation styling and scroll to top fix. Also change default tab switch speed to fast from slow.

#556866 from murfi and #226667, make named tab URLs a configurable option and strip invalid characters from names.

#555112 with contribution from Cybergarou, increase css offset and set visibility to hidden for tabs.

Roll back #226667. Using titles for anchors/ids produced invalid code when titles contained special characters.

Significant clean-up and several new features, including: #249932, support ajax loading of tabs; #307523 by moshe, update README; #537798, don't render empty tabs; #340374, set active tab on page load; #226667, named tabs; #485842 by Linxor, faster speed option.

#275760 with input from jerdavis: use jquery_ui if available. Also update the version of ui.tabs.js used. Unfortunatly we can't easily introduce a dependency on jquery_ui midversion because of dependency checking for already enabled modules. Will wait for D7.