proposal: data-table cdk-header-cell should not scroll with scroll bar

[ghost]

Bug, feature request, or proposal:

proposal

What is the expected behavior?

cdk-header-cel should not scroll with scroll bar

What is the current behavior?

cdk-header-cel scroll with scroll bar

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
material2\src\demo-app\data-table

What is the use-case or motivation for changing an existing behavior?

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

angular/material@2.0.0-beta.7-f73cc97

Is there anything else we should know?

[jelbourn]

Support for sticky heads will shortly follow after the initial release.

[riankol]

@jelbourn Is there any news on this topic yet? When do you aspect this sticky headers to be released?

[willshowell]

@riankol tracking is at #5885

[irowbin]

I guess the changes will be released in next week? @jelbourn Very excited to see the changes of long waited md-table/cdk data table.

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