bug(md-select): change the direction from rtl to ltr the options keeps the direction rtl

[jefersonestevo]

Bug, feature request, or proposal:

bug

What is the expected behavior?

when changing the direction from "rtl" to "ltr", the options direction should change together

What is the current behavior?

when changing the direction from "rtl" to "ltr", the options keep the direction "rtl"

What are the steps to reproduce?

Plunker

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

@angular/material: 2.0.0-beta.1

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