fix characters remaining hint for textarea

[nickraphael]

fix (input): Change name of local variable on md-textarea to fix hint binding of md-input.

#characterCountHintExample is the name given to both the md-input and md-textarea. This breaks the binding of the md-hint on the md-input. As the user types in the md-input field, the hint is not updated to show the remaining characters. However, when the user types in the md-textarea, the md-hint is updated on the textarea AND the input. The fix is simply to give each control a different #name.

[jelbourn]

LGTM

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