Dear Maintainer,

When run with a single filename argument, eg:

	stylus foo.stylus

stylus will obliterate the contents of foo.stylus, and replace it
with css.

This is not OK. stylus should output to stdout or foo.css


Also, the man page doesn't say anything about this. And... now that
I look more closely, the man page doesn't even say you can specify
a file on the commandline... instead in says you can specify a
command, and then doesn't document any commands that you can pass.

stylus --help has the same issue.