determine the real path of the shen.clj script in a more resilient
fashion (it should by symlink-able)
use script_path bash function in all scripts
when invoking Shen REPL w/ shen.clj script, *home-directory* should
reflect the working directory from which the REPL was launched
corrections: or -> c/or ; getProperty -> getenv
need to export shen_repl_working_dir
Merge branch 'shen-ver-16'