Bug, feature request, or proposal:
Testing the upgrade to beta 11, and noticed that md-dialog-container is incorrectly named (should have mat- prefix). mat-dialog-container CSS class is correctly applied tho.
What is the expected behavior?
md- prefix should be mat-
What is the current behavior?
What are the steps to reproduce?
Providing a Plunker (or similar) is the best way to get the team to see your issue.
Plunker template: https://goo.gl/DlHd6U

What is the use-case or motivation for changing an existing behavior?
Which versions of Angular, Material, OS, TypeScript, browsers are affected?
ng 4.4.3
material beta 11
ts 2.3.3
Is there anything else we should know?