Use realpath instead of 'readlink -f' for determining the script's absolute path.
Use realpath instead of 'readlink -f' for determining the script's absolute path.

realpath is more portable across linux and OS X since the GNU and the
BSD versions of readlink have different behavior for the same '-f' flag.

erikw/tmux-powerline,erikw/tmux-powerline,erikw/tmux-powerline