md-slide-toggle cannot be styled from outside due to encapsulation

[herkulano]

Bug:

md-slide-toggle has no encapsulation: ViewEncapsulation.None set so it cannot be easily styled from the outside.

What is the expected behavior?

encapsulation: ViewEncapsulation.None should be turn on.
It should be easy to override the component styles

What is the current behavior?

Cannot easily override component style

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

Alpha.9

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