ngIncludeCached.js

var $compileCache = function ($http, $templateCache, $compile) {
  var cache = {};

  return function (src, scope, cloneAttachFn) {
    var compileFn = cache[src];
    if (compileFn) {
        compileFn(scope, cloneAttachFn);
    } else {
      $http.get(src, { cache: $templateCache }).success(function (response) {
        var responseContents = angular.element('<div></div>').html(response).contents();
        compileFn = cache[src] = $compile(responseContents);
        compileFn(scope, cloneAttachFn);
      });
    }
  };
};

var ngIncludeCached = function ($compileCache) {
  return {
    restrict: 'ECA',
    terminal: true,
    compile: function (element, attr) {
      var srcExp = attr.ngIncludeCached || attr.src;

      return function (scope, element) {
        var src = scope.$eval(srcExp);
        var newScope = scope.$new();
        $compileCache(src, newScope, function (compiledElm, newScope) {
            element.append(compiledElm);
        });
      };
    }
  };
};

angular.module("app")
  .factory("$compileCache", ['$http', '$templateCache', '$compile', $compileCache])
  .directive("ngIncludeCached", ['$compileCache', ngIncludeCached]);

Why do you use the 'terminal' attribute on the directive?
AFAIK terminal: true would have no affect without priority.

Very late I know: It was just a copy of ngInclude with some changes, must comes from there.