Add support for spellcheck attribute on md-input

[matthewdenobrega]

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This repository's issues are reserved for feature requests and bug reports.

• Do you want to request a feature or report a bug?
  Request a feature
• What is the current behavior?
  The spellcheck attribute is ignored when creating an input from an md-input
• 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?
  The spellcheck attribute should be set on the input wrapped by the md-input when it is set on the md-input
• What is the motivation / use case for changing the behavior?
  To support use of spellcheck=true on md-inputs
• 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
• Other information
  (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix)
  I've done a simple PR at feat(input): add support for spellcheck attribute #316

[matthewdenobrega]

This applies for the min and max attributes for number inputs, and there will be others as well.

[matthewdenobrega]

Closed with #316 being merged

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