[refactor] export directive

Author: explooosion

src/modules/agm-direction.module.ts

@@ -1,7 +1,7 @@
 import { NgModule, ModuleWithProviders } from '@angular/core';
 import { AgmDirection } from '../directive/agm-direction.directive';
 
-// export * from '../directive/agm-direction.directive';
+export * from '../directive/agm-direction.directive';
 
 @NgModule({
     imports: [],