MdCard and MdListItem use base color rather than text color

[willshowell]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Default styling of text on a "light-theme" MdCard or MdListItem should be 87% black

What is the current behavior?

Text defaults to 100% black.

What are the steps to reproduce?

http://plnkr.co/edit/zkrjdBwt5wAe85FllmDe?p=preview

Is there anything else we should know?

Culprit for MdCard is here. Culprit for MdListItem is here

[kyle-burke]

Hey @willshowell, I made a PR for this here.

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