Feat: refactor routes.js express entrypoint config

Feat: express config script refactor

Feat: add state and settingsCache files

lib/middlewares/pair.js

@@ -0,0 +1,20 @@
+const pairing = require('../pairing')
+
+function pair (req, res, next) {
+  console.log("pair")
+  const token = req.query.token
+  const deviceId = req.deviceId
+  const model = req.query.model
+
+  return pairing.pair(token, deviceId, model)
+    .then(valid => {
+      if (valid) {
+        return res.json({ status: 'paired' })
+      }
+
+      throw httpError('Pairing failed')
+    })
+    .catch(next)
+}
+
+module.exports = pair