replaced shell pipe with eval, which maked argument passing work
added binary-safe Perl support
formatted generated startup code
added Ruby and Python support (still binary-safe)
added comments about security
added salt
added `exit 255' for shell scripts
added TODO
moved reading the plaintext script to the beginning; added --safe encryption with gpg, enabled it by default; improved documentation
added Python in safe mode
added Ruby and Perl in safe mode
added encryption banner URL
added encrypted script filename to the passphrase prompt in safe mode