Add activated event to docs

Author: bbrala

documentation/docs.md

@@ -293,6 +293,7 @@ Value | Description
 ---- | ---- 
 `events.show` | Called before show of the contextmenu 
 `events.hide` | Called before hide of the contextmenu
+`events.activated` | Called after activation of the contextmenu
 
 #### Example
 ```javascript
@@ -318,6 +319,11 @@ $.contextMenu({
                // Prevent the menu to be hidden.
                return false;
            }            
+       },
+       activated : function(options){
+               if( confirm('Hide menu with selector ' + options.selector + '?') === true ){
+               console.log('Menu Activated');
+           }            
        }
 });
 ```

src/jquery.contextMenu.js

@@ -1546,10 +1546,7 @@
                         'overflow-y': 'auto',
                         'top': winScrollTop + 'px'
                     });
-                } else if(
-                            ($menuOffset.top < winScrollTop) || 
-                           ($menuOffset.top + menuHeight > winScrollTop + winHeight)
-                          ){
+                } else if(($menuOffset.top < winScrollTop) || ($menuOffset.top + menuHeight > winScrollTop + winHeight)){
                     $menu.css({
                         'top': '0px'
                     });