Fix streaming for winston

During the upgrade of winston in
c3584770f2 a the class extension for
streaming was removed.

This caused silent crashes. Somehow winston simply called
`process.exit(1)` whenever `logger.write()` was called. This is really
bad and only easy to debug because of the testing right after upgrading.

However, reimplementing the stream interface as it was, didn't work, due
to the fact that `logger.write()` is already implemented and causes the
mentioned problem. So we extent the object with an `stream` object that
implements `write()` for streams and pass that to morgan.

So this patch fixes unexpected exiting for streaming towards our logging
module.

References:
https://www.digitalocean.com/community/tutorials/how-to-use-winston-to-log-node-js-applications
c3584770f2
https://stackoverflow.com/a/28824464
Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

app.js

@@ -53,7 +53,7 @@ if (config.useSSL) {
 
 // logger
 app.use(morgan('combined', {
-  'stream': logger
+  'stream': logger.stream
 }))
 
 // socket io

lib/logger.js

@@ -1,7 +1,7 @@
 'use strict'
 const {createLogger, format, transports} = require('winston')
 
-module.exports = createLogger({
+const logger = createLogger({
   level: 'debug',
   format: format.combine(
     format.uncolorize(),
@@ -17,3 +17,11 @@ module.exports = createLogger({
   ],
   exitOnError: false
 })
+
+logger.stream = {
+  write: function (message, encoding) {
+    logger.info(message)
+  }
+}
+
+module.exports = logger