Using scope.$digest() rather than scope.$apply()

Following Andy Joslin's comment -

I would use scope.$digest() on the directive's scope, which will only digest that specific scope, instead of $apply (which is global).

https://groups.google.com/forum/#!topic/angular/KMaabQCggRA
Merge pull request #25 from ramsingla/patch-1

Using scope.$digest() rather than scope.$apply()