Updates necessary for the Heroku deployment

[berezovskyi]

https://ldpjs-refimpl.herokuapp.com/

[berezovskyi]

POST is now fixed but GET returns an empty response

[jamsden]

scheme and host are the w3c names used in https://www.w3.org/Addressing/URL/url-spec.txt. These should be named using standard terms in the config.json file to avoid confusion. scheme is the name of the protocol to use, host is the name of the node to bind to.

[berezovskyi]

I have made this change so that the JSON keys match the attributes in the https://nodejs.org/docs/latest-v10.x/api/url.html

[jamsden]

I have:

	const MongoClient = require('mongodb').MongoClient;
	const client = new MongoClient(env.mongoURL, { useNewUrlParser: true });
	client.connect(function(err, client) {
		if (err) {
			callback(err);
			return;
		}

		db = client.db(env.dbName);
		exports.graphs = graphs();
		console.log("Connected to MongoDB at: "+env.mongoURL);
		ensureIndex();

Here.

[jamsden]

n3 1.1.1 is the latest and requires significant changes in the Mongo db. Not sure this is worth doing in this sample app. ldp-service uses rdflib instead. Perhaps we should leave LDPjs alone and do new development in ldp-app, ldp-services.

[berezovskyi]

Thanks Jim. Very likely I will abandon this patch. Let me try the ldp-app first.

[jamsden]

Note viz.js doesn't yet work on ldp-app because it had a hard dependency on the MongoDB representations of triples.