Add transaction versioning, tx cancellation (#79)

lib/routes.js

@@ -15,6 +15,7 @@ const plugins = require('./plugins')
 const helpers = require('./route-helpers')
 const poller = require('./poller')
 const Tx = require('./tx')
+const E = require('./error')
 
 const argv = require('minimist')(process.argv.slice(2))
 
@@ -108,6 +109,10 @@ function postTx (req, res, next) {
 
     return res.json(tx)
   })
+  .catch(err => {
+    if (err instanceof E.StaleTxError) return res.status(404).json({})
+    throw err
+  })
   .catch(next)
 }
 
@@ -270,7 +275,11 @@ app.get('/tx/:id', getTx)
 app.get('/tx', getPhoneTx)
 
 app.use(errorHandler)
-app.use((req, res) => res.status(404).json({error: 'No such route'}))
+app.use((req, res) => {
+  console.log('DEBUG98')
+  console.log(req.route)
+  res.status(404).json({error: 'No such route'})
+})
 
 localApp.get('/pid', (req, res) => {
   const deviceId = req.query.device_id