Cleaned up code and used ES6 string templating

app/server/bot/events/error.js

@@ -0,0 +1,19 @@
+module.exports = (socket) => {
+
+  socket.mcbot.on('error', (error) => {
+
+    // this is okay because the connection was ended
+    if (error.toString() === 'Error: write after end') return;
+
+    // log the error in the client's buffer
+    socket.emit('buffer:error', error);
+
+    // if the bot is logged in and/or is an entity, destroy it
+    if (socket.mcbot.entity) socket.mcbot.end();
+
+    // delete the bot
+    delete socket.mcbot;
+
+  });
+
+};