text color md-fab and md-mini-fab is not the default-contrast color

[riankol]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

The text color of a md-fab or md-mini-fab should be the default-contrast of the chosen theme accent color. For example when using the prebuilt the indigo-pink the default $accent is set to A200, so according to the palette the contrast A200 is white, so the text-color of the md-fab or md-mini-fab should be white against a pink background-color.

What is the current behavior?

The text-color is set to the current color (in my case grey).

What are the steps to reproduce?

Providing a Plunker (or similar) is the best way to get the team to see your issue.
Plunker template: http://plnkr.co/edit/LbeegL?p=preview
http://stackoverflow.com/questions/40478419/angular-material2-button-text-color

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

readability

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

I'm using angular-material 2.0.0-beta.1

Is there anything else we should know?

No

[riankol]

Even so, when I add a class in my custom-style.scss, the md-contast color is overwritten. This is my custom-style.scss:
`@import '../lib/@angular/material/core/theming/all-theme';

@include md-core();

$primary: md-palette($md-grey);
$accent: md-palette($md-light-blue, 700, 600, 800);

$theme: md-light-theme($primary, $accent);

.accent-text-color{
color: md-color($accent, 700);
}
.accent-background-color{
background-color: md-color($accent, 700);
color: md-contrast($accent,700);
}
.accent-border-color{
border-color: md-color($accent, 700);
}
.primary-background-color{
background-color: md-color($primary, 50);
}
.primary-border-color{
border-color: md-color($primary, 700);
}

md-list-item.zoekresultaat:hover{
background-color: md-color($accent, 700);
color: md-contrast($accent,700);
cursor: pointer;
}

@include angular-material-theme($theme);`

I can use all this classes in my whole application, but the contast color always is overwritten.

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