Material green contrast color does not match material.io guidelines contrast color

[codemasterover9000]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

That colors exactly match the color palettes on material.io guidelines.

What is the current behavior?

Sass palette $mat-green's 500 hue, has a white contrast color instead of the guideline's black color

What are the steps to reproduce?

$green : mat-palette($mat-green);
$contrast: mat-contrast($mat-green, 500); //which is default

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

It doesn't match the guidelines on material.io

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

angular/material 2.0.0-beta.10

Is there anything else we should know?

[angular-automatic-lock-bot]

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