title: Error : Please add a @NgModule annotation when using latest cli and material design
body: <p>I am importing material modules as follow in app module:</p>
  
  <pre><code>import { NgModule } from '@angular/core';
  import { SharedModule } from 'app/shared/shared.module';
  import { AppRoutingModule } from './app-routing.module';
  import {
    MdTooltipModule,
    MdTabsModule,
    MdSlideToggleModule,
    MdIconModule,
    MdDialogModule,
    MdButtonModule,
    MdListModule,
    MdCardModule,
    MdToolbarModule,
    MdProgressSpinnerModule,
    MdProgressBarModule,
  } from '@angular/material';
  
  
  @NgModule({    
    declarations: [
      //..components
    ],
    imports: [
      BrowserModule,
      BrowserAnimationsModule,
   MdTooltipModule,
    MdTabsModule,
    MdSlideToggleModule,
    MdIconModule,
    MdDialogModule,
    MdButtonModule,
    MdListModule,
    MdCardModule,
    MdToolbarModule,
    MdProgressSpinnerModule,
    MdProgressBarModule,
  
      SharedModule,
      AppRoutingModule,
    ],
    providers: [
      //..
    ],
    bootstrap: [AppComponent]
  })
  export class AppModule { }
  </code></pre>
  
  <p>This gives an error as follow for each Md Module. I also updated my Angular CLI and Material design. I also tried to import only MaterialModule, but it is deprecated.</p>
  
  <blockquote>
    <p>ERROR in Unexpected value 'MdTooltipModule in
    E:/Code/employee-web/node_modules/@angular/material/typings/index.d.ts'
    impor
        ted by the module 'AppModule in E:/Code/employee-web/src/app/app.module.ts'. Please add a @NgModule
    annotation.</p>
  </blockquote>
  
  <p>How can I get rid of this?</p>