Remove wallet creation HTTP method

This functionality is now completely implemented at client-side (machine).

lib/routes.js

@@ -155,15 +155,6 @@ function postTx (req, res, next) {
     .catch(next)
 }
 
-function createWallet (req, res, next) {
-  const pi = plugins(req.settings, req.deviceId)
-  pi.newAddress(req.tx)
-    .then(addr => {
-      respond(req, res, addr)
-    })
-    .catch(next)
-}
-
 function stateChange (req, res, next) {
   helpers.stateChange(req.deviceId, req.deviceTime, req.body)
     .then(() => respond(req, res))