Add sbin to PATH for brew
Updates to tarcrypt function.

It still creates a gpg encrypted tar, but now it uses keys and signs the file.  It retains symetric encryption as a failsafe should I need the data and not have my gpg key around.

The tarunsignedcrypt alias is also added which essentially does what tarcrypt used to do.  Symetrically encrypt.  Again, useful on systems where I don't want my gpg key.