Skip linking if elemented already removed in the meantime

[marcin-wosinek]

The edge case I've found was when:

• view with click-outside was quickly created & remeved - multiple times per second
• randomly there were listeners added for already removed controllers

My assumption was:

it can be that with quick enough reloads we get:

• linking delayed as:

// postpone linking to next digest to allow for unique id generation               
$timeout(function() {

• destroy done in the same digest (if it's even possible), of poped in before the $timeout callback
  if this is true, checking if the scope exists before calling close should fix it.

the assumptions turned out to be right - double checking in the callback with:

      if ($scope.$$destroyed === true) {
        console.log('we are dead!');
        return;
      }

removed the issue form the application code.

In this PR I'm trying to address the rootcause issue

[marcin-wosinek]

hack to make the script installable directly from repo. The above one is either typo (it has @ no more), or makes npm double check the source of the code.