I believe apm must have been buggy - example output that I found online
showed `tr` was mangling paths with spaces in it. Should be fixed.
Also, use dscl on OS X in __fish_complete_users.fish like
__fish_print_users.fish already does.
New sample prompt from Acidhub (github.com/acidhub)
This prompt show user|path (full), and a small symbol to
show last command status.
If in a git repository, it's show after the path several
symbols to indicate the branch status and the branch name.
Very handy to me so far.
Signed-off-by: Fernando Manfredi <contact@acidhub.click>