input: no support for larger font sizes

[clshortfuse]

Actual Behavior:

• What is the issue? * Changing font size of input breaks rendering
• What is the expected behavior? mdInputContainer should allow different text sizes

Angular Versions: *

• Angular Material Version: v1.1.1

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For accessibility reasons, we should allow developers the ability to scale just the text of objects without having to scale the entire object. Not all users can use a set font-size of 16px. Support for larger font is also part of the Material Design spec.

Note, I have already created a resolution to this as part of the CSS density project.