Update two projects maintained by new developers, add RubaXa

All in alphabetical order.

Author: dandv

source/index.html.haml

@@ -224,16 +224,19 @@
   %p Listed in alphabetical order
   %ul
     %li
-      %a(href="http://farhadi.ir/projects/html5sortable/") HTML5 Sortable
-      (uses native dnd events)
+      %a(href="https://github.com/voidberg/html5sortable") HTML5 Sortable
+      (uses native dnd events, supports IE5.5+, ~180 GitHub stars)
     %li
       %a(href="http://jqueryui.com/demos/sortable/") jQuery UI sortable
     %li
       %a(href="http://dbushell.github.com/Nestable/") Nestable
-      (requires no jQuery UI)
+      (requires no jQuery UI, ~1200 GitHub stars)
     %li
-      %a(href="http://mjsarfatti.com/sandbox/nestedSortable/") nestedSortable
-      (an extension of jQuery UI)
+      %a(href="https://github.com/ilikenwf/nestedSortable") nestedSortable
+      (an extension of jQuery UI, ~75 GitHub stars)
+    %li
+      %a(href="https://github.com/RubaXa/Sortable") RubaXa's Sortable
+      (supports touch devices and AngularJS, ~800 GitHub stars)
     %li
       %a(href="http://yuilibrary.com/yui/docs/sortable/") YUI sortable