Support Tilde (~) to refer to users home folder

[Konafets]

To setup connections in config.php when providing a SSH key you must set a path to that key. To avoid hardcoding the full path like /Users/foo/.ssh/deploy it might be a good idea to provide a relative path like ~/.ssh/deploy.

[Anahkiasen]

This is done already in R3, will see if I can backport it maybe

[harrisred]

+1