Theme colors incorrect for md-slide-toggle

[code-tree]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

md-slide-toggle obeys the Material Design spec

What is the current behavior?

md-slide-toggle uses background color for .md-slide-toggle-thumb, and possibly incorrect in other areas as well. This is especially noticeable in dark theme, where thumb is very hard to see.

What are the steps to reproduce?

Look at md-slide-toggle in both light/dark themes

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

Bug

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

"@angular/material": "^2.0.0-alpha.9-3",

Is there anything else we should know?

No

[code-tree]

Great, thanks!

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