fix lint

Author: tinayuangao

src/demo-app/a11y/dialog/dialog-a11y.ts

@@ -1,5 +1,5 @@
 import {Component} from '@angular/core';
-import {MdDialog, MdDialogRef, MD_DIALOG_DATA} from '@angular/material';
+import {MdDialog} from '@angular/material';
 
 
 @Component({

src/demo-app/a11y/dialog/dialog-neptune-a11y.html

@@ -15,7 +15,7 @@ <h2 md-dialog-title>Neptune</h2>
   </p>
 </md-dialog-content>
 
-<md-dialog-actions [attr.align]="actionsAlignment">
+<md-dialog-actions>
   <button md-raised-button color="primary" md-dialog-close>Close</button>
 
   <a md-button color="primary" href="https://en.wikipedia.org/wiki/Neptune" target="_blank">