Native input capabilities can't be use

[ocarreterom]

Bug, feature request, or proposal:

Bug.

What is the expected behavior?

The native capability of highlight text, date picker, etc, in input elements.

What is the current behavior?

This PR (#3878) removes the pointer-events: none attribute from md-input-placeholder causing to be unable to use correctly any native input element (e.g native date picker).

What are the steps to reproduce?

Try to use the native date picker: http://plnkr.co/edit/o0vZi1m7RSGt1MSPNxvR?p=preview

Version

material: 2.0.0-beta.3

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