Add missing definition

In angular you can either write `directive('myDirective', ['$http', function($http) {...}])`, which is minification safe, but it's also possible to write `directive('myDirective', function($http) {...})` which might not be minification safe, but valid angular nonetheless.

angularjs/angular.d.ts

@@ -238,6 +238,7 @@ declare namespace angular {
          * @param directiveFactory An injectable directive factory function.
          */
         directive(name: string, inlineAnnotatedFunction: any[]): IModule;
+        directive(name: string, injectionFunction: Function): IModule;
         directive(object: Object): IModule;
         /**
          * Register a service factory, which will be called to return the service instance. This is short for registering a service where its provider consists of only a $get property, which is the given service factory function. You should use $provide.factory(getFn) if you do not need to configure your service in a provider.