Duplicate id's on md-input

[matthewdenobrega]

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https://github.com/angular/material2/blob/master/CONTRIBUTING.md#question.
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• Do you want to request a feature or report a bug?
  Report a bug
• What is the current behavior?
  The id attribute of an md-input is copied onto the inner input element, which results in duplicate id's on the page.
• If the current behavior is a bug,
  please provide steps to reproduce and if possible a minimal demo of the problem
  via https://plnkr.co or similar.
• What is the expected behavior?
  This is as per the design document - 'The id will be transferred to the native input element.' - however because the original element also has the id, this results in duplicate id's on the page. The internal input id should be modified to avoid this.
• What is the motivation / use case for changing the behavior?
  Current behavior is not compliant with the HTML spec
• Which version of Angular and Material, and which browser and OS does this issue affect?
  Did this work in previous versions of Angular / Material?
  Please also test with the latest stable and snapshot versions.
  Tested on 2.0.0.alpha-2 in Chrome
• Other information
  (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix)
  I've sketched a possible solution in fix(input): prefix copied input id #321

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