fix to issue #28

https://github.com/xoxco/jQuery-Tags-Input/issues/28
onChange now receives the tag added or removed.

jquery.tagsinput.js

@@ -126,7 +126,7 @@
 					{
 						var i = tagslist.length;
 						var f = tags_callbacks[id]['onChange'];
-						f.call(this, $(this), tagslist[i]);
+						f.call(this, $(this), tagslist[i-1]);
 					}					
 				}
 		

test.html

@@ -25,7 +25,12 @@
 			alert("Removed a tag: " + tag);
 		}
 		
+		function onChangeTag(input,tag) {
+			alert("Changed a tag: " + tag);
+		}
+		
 		$(function() {
+
 			$('#tags_1').tagsInput();
 			$('#tags_2').tagsInput({
 				onChange: function(elem, elem_tags)
@@ -43,8 +48,9 @@
 				autocomplete_url:'test/fake_json_endpoint.html' // jquery ui autocomplete requires a json endpoint
 			});
 			
+
 // Uncomment this line to see the callback functions in action
-//			$('input.tags').tagsInput({onAddTag:onAddTag,onRemoveTag:onRemoveTag});		
+//			$('input.tags').tagsInput({onAddTag:onAddTag,onRemoveTag:onRemoveTag,onChange: onChangeTag});		
 
 // Uncomment this line to see an input with no interface for adding new tags.
 //			$('input.tags').tagsInput({interactive:false});