opening datepicker affect the width of all defined datepickers

[aitboudad]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Each calendar should have it's own width

What is the current behavior?

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue-nqsguw

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

2.0.0-beta.12

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