Created a wrapper around child_process.execFile() that runs a command as a different user via (hopefully safe) sudo, while also sanity checking the parameters (eg. username) it feeds the sudo command. Further testing is needed, however.

Created a (somewhat) functional login screen, which will accept any credentials and return either a HTTP 200 or 401 status code, depending on whether the username has special characters or not. Still a long way to go - the login system still needs PAM integration of some sort.

Created wrapper class around http.Server that cleans up abandoned socket files upon .listen(), rather than just giving up with an EADDRINUSE error if a socket with the specified name already exists. See HttpSocketServer in common/http-sockets.js

Lots of changes - including init.js no longer needing root, and a (somewhat) working stub for login-service.js

Made gitignore ignore temporary vim files; made init.js drop its privileges; improved description of package.json