Fixed Openssh installation issues

Fixed "The filename, directory name, or volume label syntax is incorrect." (http://pastie.org/8588258 ) (floppy/install-openssh-sshd.bat)
Upgraded to Openssh 6.4 (floppy/install-openssh-sshd.bat)
Removed download after installation (floppy/install-openssh-sshd.bat)
Changed '!'s back to '%', as they were unneccessary (floppy/install-openssh-sshd.bat)
Changed C:\Users\vagrant to %USERPROFILE% (floppy/install-openssh-sshd.bat)