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Pull #386

travis-ci

Fix IV handling for AES, test consecutive calls

M2Crypto defaults to padding the ciphertext,
and the previous implementation danced around that awkwardly
by padding and unpadding ciphertext on decryption
and updating the IV manually.
`m2.cipher_set_padding(context, 0)`
allows to shoulder the IV handling back to where it belongs
and to get rid of unnecessary context reinitializations.
(Investigative work courtesy of @tomato42:
 #377 (review)).

This commit mirrors changes from #377, but for AES
and adds the same unit test as well.

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