Update date format in File/X509.php

Update it to be consistent with https://github.com/phpseclib/phpseclib/commit/bdd42c448b21b87ef06aa693240cb2538c53d514

Thanks runaway518!
Merge branch 'master' of https://github.com/phpseclib/phpseclib
Small CS fix [2]
Use enablePTY() to get a PTY with exec() calls. While exec() is running
you can use read() and write() to interact with the shell.
Merge pull request #71 from tamagokun/exec_with_pty

enablePTY() disablePTY() for use with exec()
SFTP: Add the ability to write to specific parts of files
SFTP: Add touch function

Also make it so chmod will auto-switch the filename / permissions if they're not in the "right" order (PHP's chmod and ftp_chmod order them differently from each other so this'll make phpseclib consistent with both)
Merge pull request #2 from phpseclib/master

Snyc