fix(input): allow pointer events on placeholder

[crisbeto]

Removes the pointer-events: none from the input placeholder in order to allow for users to bind events to it. Clicking through isn't necessary anyway, because it automatically redirects focus to the underlying input already.

[mmalerba]

LGTM

[aldo-roman]

Fixes #3823

[jelbourn]

This somehow made one project's e2e tests start to fail, needs investigation by caretaker.

[aldo-roman]

Hi @jelbourn do you have any link where to inspect the failed tests? The bot just mentioned all Travis build passed, including e2e

https://travis-ci.org/angular/material2/jobs/217799152

[jelbourn]

@aldo-roman before merging on PRs we run them against the tests for all Google applications that use the components. This happens on Google's internal infrastructure rather than on github / travis.

The team that owns these particular tests have made a change that should resolve the issue, I'll be able to confirm when the next set of commits are synced.

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