fix(input): ensure all of label displays on safari

[kara]

Closes #795

@hansl, can you take a look? The overflow:hidden style added here seems to cut off labels in iOS. Removing it fixes the problem, and I can't seem to see any visual difference in major browsers.

[hansl]

LGTM.

[jean-merelis]

@hansl @kara the overflow:hidden is related to this issue #689 (comment)

My suggestion is expand .md-input-wrapper:
#863 (comment)

[mcalmus]

I am showing error messages via md-hint. If the message is too longer and must wrap it partially overlaps the input.

[jasonburrows]

@mcalmus me too - did you find a solution for this?

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