Merge pull request #4421 from borisyankov/basarat-patch-1

feat(ace) specialize 'change'

ace/ace.d.ts

@@ -1034,9 +1034,10 @@ declare module AceAjax {
      * Event sessions dealing with the mouse and keyboard are bubbled up from `Document` to the `Editor`, which decides what to do with them.
     **/
     export interface Editor {
-
-        addEventListener(ev: string, callback: Function);
         
+        addEventListener(ev: 'change', callback: (ev: EditorChangeEvent) => any);
+        addEventListener(ev: string, callback: Function);
+
         inMultiSelectMode: boolean;
 
         selectMoreLines(n: number);
@@ -1712,6 +1713,13 @@ declare module AceAjax {
         **/
         new(renderer: VirtualRenderer, session?: IEditSession): Editor;
     }
+    
+    interface EditorChangeEvent {
+        start: Position;
+        end: Position;
+        action: string; // insert, remove
+        lines: any[];
+    }
 
     ////////////////////////////////
     /// PlaceHolder