title: ERROR: @angular/material/material has no exported member 'MdButtonModule'
body: <p>Error below arose after upgrading from @angular/material <strong>2.0.0-beta.11</strong> to <strong>2.0.0-beta.12</strong>:</p>
  
  <p>Module <em>@angular/material/material</em> has no exported member 'MdButtonModule'.</p>
  
  <p>Typescript-code:</p>
  
  <pre class="lang-typescript prettyprint-override"><code>import { MdButtonModule } from '@angular/material';
  </code></pre>
  
  <p>What happened?</p>
  
  <blockquote>
    <p>ERROR in c:/dev/my-proj/src/app/app-material/app-material.module.ts
    (4,3): Module
    '"c:/dev/my-proj/node_modules/@angular/material/material"' has no
    exported member 'MdButtonModule'. ERROR in
    c:/dev/my-proj/src/app/app-material/app-material.module.ts (5,3):
    Module '"c:/dev/my-proj/node_modules/@angular/material/material"' has
    no exported member 'MdCardModule'. ERROR in
    c:/dev/my-proj/src/app/app-material/app-material.module.ts (6,3):
    Module '"c:/dev/my-proj/node_modules/@angular/material/material"' has
    no exported member 'MdCheckboxModule'. ERROR in
    c:/dev/my-proj/src/app/app-material/app-material.module.ts (7,3):
    Module '"c:/dev/my-proj/node_modules/@angular/material/material"' has
    no exported member 'MdIconModule'. ERROR in
    c:/dev/my-proj/src/app/app-material/app-material.module.ts (8,3):
    Module '"c:/dev/my-proj/node_modules/@angular/material/material"' has
    no exported member 'MdOptionModule'. ERROR in
    c:/dev/my-proj/src/app/app-material/app-material.module.ts (9,3):
    Module '"c:/dev/my-proj/node_modules/@angular/material/material"' has
    no exported member 'MdProgressSpinnerModule'. ERROR in
    c:/dev/my-proj/src/app/app-material/app-material.module.ts (10,3):
    Module '"c:/dev/my-proj/node_modules/@angular/material/material"' has
    no exported member 'MdSelectModule'. ERROR in
    c:/dev/my-proj/src/app/app-material/app-material.module.ts (11,3):
    Module '"c:/dev/my-proj/node_modules/@angular/material/material"' has
    no exported member 'MdSidenavModule'. ERROR in
    c:/dev/my-proj/src/app/app-material/app-material.module.ts (12,3):
    Module '"c:/dev/my-proj/node_modules/@angular/material/material"' has
    no exported member 'MdToolbarModule'. ERROR in Error: MdButtonModule
    is not an NgModule
        at _getNgModuleMetadata (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:140:15)
        at _extractLazyRoutesFromStaticModule (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:109:26)
        at c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:129:27
        at Array.reduce (native)
        at _extractLazyRoutesFromStaticModule (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:128:10)
        at c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:129:27
        at Array.reduce (native)
        at _extractLazyRoutesFromStaticModule (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:128:10)
        at Object.listLazyRoutesOfModule (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:53:22)
        at Function.NgTools_InternalApi_NG_2.listLazyRoutes (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_api.js:91:39)
        at AotPlugin._getLazyRoutesFromNgtools (c:\dev\my-proj\node_modules\@ngtools\webpack\src\plugin.js:207:44)
        at _donePromise.Promise.resolve.then.then.then.then.then (c:\dev\my-proj\node_modules\@ngtools\webpack\src\plugin.js:443:24)</p>
  </blockquote>