panelClass Missing from MdDialogConfig

[BHoma91]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

To be able to add panelClass: "customModal" to the MdDialogConfig as specified in the Documentation.

What is the current behavior?

Given Error Message: Object literal may only specify known properties, and 'panelClass' does not exist in type 'MdDialogConfig'

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

"@angular/material": "^2.0.0-beta.3",
"@angular/animations": "^4.0.1"

Is there anything else we should know?

All other additional classes from the documentation is present in MdDialogConfig

[willshowell]

See #4961. panelClass exists on master but the docs were accidentally published prematurely

[BHoma91]

Ah, didn't see that. Thanks

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