fix(autosize): export md-autosize directive

[devversion]

Note: Not sure whether mdTextareaAutosize is more appropriated here. Also notice that the method is already tested by the first test here

Closes #2419

[jelbourn]

You're right, it should be mdTextareaAutosize (and the selector should be that too...).

[devversion]

@jelbourn Updated the directive. Now the directive feels pretty long.

[jelbourn]

Should be mdTextareaAutosize (camelCase)

We should also make the old selector work at the same time as the new one for one release.
(so both md-autosize and mdTextAreaAutosize)

[devversion]

Updated it. Didn't add it for matTextareaAutosize because according to PR #2244 it's not needed.

[jelbourn]

There should be a mat version too, but I've been lax on watching for that and will need to do another pass (probably at the same time I remove the deprecated selectors / properties).

[jelbourn]

LGTM

[kara]

@devversion Can you rebase?

[devversion]

@kara Done.

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