Update ng-map.js

It seems that without setting the third parameter to `true`, I get a weird crash in one of my projects, regarding the digest cycles.

The error is:
`[$rootScope:infdig] 10 $digest() iterations reached. Aborting!`

Author: Razvan Tudosa

build/scripts/ng-map.js

@@ -572,7 +572,7 @@ angular.module('ngMap', []);
 
 	  scope.$watch('[' + varsToWatch.join(',') + ']', function() {
 	    customMarker.setContent(orgHtml, scope);
-	  });
+	  }, true);
 
 	  customMarker.setContent(element[0].innerHTML, scope);
 	  var classNames = element[0].firstElementChild.className;
@@ -3213,4 +3213,4 @@ angular.module('ngMap', []);
 
 
 	return 'ngMap';
-}));
+}));