fix(input): $evalAsync than $apply on input blur

[PatrickJS]

without $evalAsync I would have to wrap a few directives in a setTimeout to prevent digest loop conflicts

angular.module('directives', [])
.directive('focusOn', function($parse) {
  return function(scope, element, attrs) {

    // avoid $digest in progress
    setTimeout(function() {
      var getter = $parse(attrs.focusOn);
      if (getter(scope)) {
        element[0].focus();
      }
    }, 0);

  };

})

[Narretz]

This is similar to #6910
$evalAsync is probably the most unstable way to fix this because you cannot guarantee that digest and event loop are in sync (though it worked for me). "safe apply" is the better idea, although @petebacondarwin says it won't work.