Rijndael: Performance update

Performance update for Rijndael
AES: Performance update

Performance update for AES
Related to: https://github.com/phpseclib/phpseclib/pull/65
Merge pull request #66 from petrich/patch-5

AES: Performance update
Merge pull request #65 from petrich/patch-3

Rijndael: Performance update
Rijndael, AES: CS adjustments