Tabs - Desktop padding doesn't meet design specifications

[frankspin89]

Bug, feature request, or proposal:

Type: Bug

What is the expected behavior?

Tabs should have a 24px left and right padding on desktop.

What is the current behavior?

Current desktop padding for tabs are 12px left and right.

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

Follow the material.io guidelines.

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

• OS: macOs Sierra
• Chrome: Version 56.0.2924.87 (64-bit)
• Angular: 4.0.0-rc.1
• Material: 2.0.0-beta.2

Is there anything else we should know?

Introduce a breakpoint for desktop screens. Use $gt-md breakpoint (min-width 1280px);

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