Composer: let mcrypt_compat "provide" mcrypt req

reset buffer in streams

reset buffer in streams

Composer: require phpseclib >= 2.0.11 instead of >= 2.0.10

1.0 branch didn't fully support cfb mode

add unit test for last commit

cfb mode now works with phpseclib 2.0

As the ECB mode cannot use IVs, allow null IVs.

objects don't need to be passed by reference

add missing mcrypt_get_* functions