Inconsistent coloring for some components when not using 500 colors

[mhengelein]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

When handing a non-500 color into the mat-palettes, primary and warn (not accent) components should be rendered with this color, not the corresponding 500 color of the same palette

$primary: mat-palette($mat-blue, 800, 200, 900);
--> Should take blue-800, not blue-500

What is the current behavior?

Some components always use 500 colors
This applies to the following components when marked as "primary" or "warn":
Checkbox, Chip, Tab, Slider

What are the steps to reproduce?

Define a palette with a non-500 color as primary color

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

Consistent coloring behaviour

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

angular-material 2.0.0-beta.2
angular 4.0.0

probably all browsers (tested in chrome, firefox, safari)

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