Merge pull request #1 from phpseclib/master

pullrequest
Merge pull request #2 from phpseclib/master

Snyc
Merge pull request #3 from phpseclib/master

Sync
AES/Rijndael Performance Update [3]

Performance Update for AES/Rijndael
Removed Debug function...

Removed Debug function...
Merge pull request #74 from petrich/AES-Rijndael-Performance-Update

AES/Rijndael performance update [3]
SFTP: Redo mkdir() and _realpath()

Also make it so nlist() caches directories as well