Text inside tooltip does not follow relevant direction

[HarelM]

Bug, feature request, or proposal:

Bug/feature

What is the expected behavior?

Tooltip text direction should follow parent direction or be configurable

What is the current behavior?

Tooltip text direction is always ltr (I think, I didn't manage to change it without external class)

What are the steps to reproduce?

http://plnkr.co/edit/4C7eFaJk9HibjfWtHgIC?p=preview
See text direction in tooltip's for the button

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

Allow control on the tooltip's text direction

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

angular 4.0.3 with material 2.0

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