title: StoreModule.forFeature does not exist
body: <p>Im trying to take an existing ngrx Store State and refactor it into sub feature modules.The problem is when I'm using StoreModule.forFeature in my feature modules imports... I get an error during compile:</p>
  
  <pre><code>ERROR in [at-loader] ./src/app/components/login/login.module.ts:67:21
  TS2339: Property 'forFeature' does not exist on type 'typeof StoreModule'.
  </code></pre>
  
  <p>I have actually searched the node_modules/@ngrx/store for "forFeature" which yielded no results. I then re-installed both  @ngrx/store &amp; @ngrx/core, still getting no search results for 'forFeature'. I checked the documentation and 'forFeature' is still listed, not depracted, at list in the docs.</p>
  
  <p>The importing statements are as follows:</p>
  
  <pre><code>import {StoreModule} from "@ngrx/store";
  import {reducers} from "./rdx/reducers/index"; ...
  @NgModule({
  imports: [StoreModule.forFeature('loginFeature',reducers)]
  ...
  }
  </code></pre>
  
  <p>the versions im using o NGRX as shown in the package json are as follows:</p>
  
  <pre><code>"@ngrx/core": "^1.2.0",
  "@ngrx/store": "^2.2.3",
  </code></pre>
  
  <p>Also searched google for this issue with no result. only results for for the depration of "forRoot" to "provideStore" which I already use.</p>