CLI modularized, express injection allowed

[tomasklapka]

As issued in #574
This is a simple modularization of CLI so it is possible to reuse it and inject own express like this:

#!/usr/bin/env node

const startCli = require('solid-server').startCli
const express = require('express')
const rdfFormatsProxy = require('http-rdf-formats-proxy')
const server = express()

server.get('/version', function (req, res) {
  res.json({ "version": require('./package.json').version })
})
server.use('/rdf-formats-proxy', rdfFormatsProxy())

startCli(server)

EDIT: renamed cli() to startCli()

[RubenVerborgh]

Approved with minor change suggestions.

[RubenVerborgh]

(nitpick) Make this one line?

[RubenVerborgh]

Could the function name be more descriptive? Because it doesn't return anything. Maybe startCli or something like this?

[RubenVerborgh]

Perhaps all of these can become const now.

[RubenVerborgh]

Thanks!