Support serving over HTTPS

[shuffle2]

I am new to node.js (so probably something better should be done), but I'm using the following on my server:

diff --git a/src/app.js b/src/app.js
index a37291f..4a14eef 100644
--- a/src/app.js
+++ b/src/app.js
@@ -30,6 +30,8 @@ const PGP = require('./service/pgp');
 const PublicKey = require('./service/public-key');
 const HKP = require('./route/hkp');
 const REST = require('./route/rest');
+const fs = require('fs');
+const https = require('https');
 
 let mongo, email, pgp, publicKey, hkp, rest;
 
@@ -123,7 +125,12 @@ function injectDependencies() {
 if (!global.testing) { // don't automatically start server in tests
   co(function *() {
     let app = yield init();
-    app.listen(config.server.port);
+    let https_options = {
+      key: fs.readFileSync('privkey.pem'),
+      cert: fs.readFileSync('cert.pem')
+    };
+    https.createServer(https_options, app.callback()).listen(config.server.port);
     log.info('app', 'Ready to rock! Listening on http://localhost:' + config.server.port);
   }).catch(err => log.error('app', 'Initialization failed!', err));
 }

This is because keyserver is running on a different machine than the reverse proxy (which has the HTTPS server actually talking to the browser client), and I wish to avoid the "https added and removed here" problem.

[tacerus]

Not a JS expert either, but great patch for me, thank you!