Add dialog content elements

[jelbourn]

This will look something like

<!-- user-profile-dialog.html -->
<h3 md-dialog-title>
  User Profile
  <button md-dialog-close></button>
</h3>
<md-dialog-content>
  ...
</md-dialog-content>
<md-dialog-actions>
  <button md-button>SAVE</button>
</md-dialog-actions>

[michaeljota]

Thanks! 👍

PS: GitHub needs reactions to issues references.

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