[Fix #425] Rewrite module ssh-agent; rename it to ssh
Make gpg-agent and ssh-agent work with each other
[Fix #437] Always set $TMPDIR
Do not substitute /tmp since $TMPDIR is always set
Add the RubyGems bin directory to PATH on other Unix systems

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
[Fix #436] Remove Bombich rsync references
Added node to the path
Merge commit '20655c8b66907ff3cc879a8cbe7b82173b597e33' into develop

Conflicts:
	modules/ssh/README.md
	modules/ssh/init.zsh
	runcoms/zpreztorc