Skip `#!` in the beginning of a file

[ascii766164696D]

I'm not sure if it's a bug, but following code is valid in nodejs, however it causes exception when it's parsed by narcissus.

#!/usr/local/bin/node
console.log(1)

I'm leaving here the fix in case someone want to edit a file with #! construction:
Edit /usr/local/narcissus/lib/jslex.js:210:

if (this.lineno == 1 && ch === '#' && next === '!') {
    for (;;) {
        ch = input[this.cursor++];
        next = input[this.cursor];
        if (ch === '\r') {
            if (next !== '\n') ch = '\n';
        }
        if (ch === '\n') {
            if (this.scanNewLines) {
                this.cursor--;
            } else {
                this.lineno++;
                break;
            }
        }
    }
} else

I'm sorry that I'm doing it here, just because https://github.com/mozilla/narcissus has no bug-tracker, and I think the fix might help someone.