angular2-material 2 icons are not shown
<p>I am working on an Angular 2 project, using Material 2. For some reason icons are not shown, just what's supposed to be the "key" of the icon as text.</p>

<p>app.module:</p>

<pre><code>  ...    
    import {MdButtonModule} from "@angular2-material/button";
    import {MdIconModule, MdIconRegistry} from "@angular2-material/icon";
    ...

    @NgModule({
      declarations: [AppComponent,... CollapseableComponent],
      imports: [... MdButtonModule, MdIconModule, MdInputModule],
      providers: [{
        provide: LocationStrategy,
        useClass: HashLocationStrategy
      }, ... MdIconRegistry],
      bootstrap: [AppComponent]
    })
    export class AppModule {

    }
</code></pre>

<p>index.html:</p>

<pre><code>...
    &lt;link href=”https://fonts.googleapis.com/icon?family=Material+Icons" rel=”stylesheet”&gt;
  &lt;/head&gt;
...
</code></pre>

<p>I tried several ways:</p>

<pre><code>  &lt;button md-fab&gt; &lt;md-icon&gt;add&lt;/md-icon&gt;&lt;/button&gt;
    &lt;button md-fab&gt; &lt;md-icon class="md-elevation-z1"&gt;create&lt;/md-icon&gt;&lt;/button&gt;
    &lt;button md-icon-button&gt;add&lt;/button&gt;
</code></pre>

<p>I guess I tried about 5 more permutations, but all with the same result. I see the button, but with text on it. Just the icon alone also did not display in any of these approaches.</p>