Input placeholder is not hiding if parent's visibility:hidden;

[davidgabrichidze]

Bug, feature request, or proposal:

BUG

What is the expected behavior?

Children content should be invisible, when parent's visibility:none

What is the current behavior?

.md-input-placeholder.md-empty class overrides parents visibility.

What are the steps to reproduce?

set visibility: hidden to parent div, containing input with placeholder.

Providing a Plunker (or similar) is the best way to get the team to see your issue.
Plunker template: http://plnkr.co/edit/o077B6uEiiIgkC0S06dd

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

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

angular rc1, material2 alpha.5

Is there anything else we should know?

Can submit fix PR, If BUG is accepted

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