Save migrations file on db (#215)

* Revert "Migration sql changes (#199)"

This reverts commit 12c834469c.

* Save migrate file on db

* Add message on migration error in lamassu-update

migrations/012-add-hd-path-serial.js

@@ -2,7 +2,7 @@ var db = require('./db')
 
 exports.up = function (next) {
   var sql = [
-    `CREATE TABLE IF NOT EXISTS cash_out_hds (
+    `create table cash_out_hds (
       session_id uuid PRIMARY KEY,
       crypto_code text NOT NULL,
       hd_serial integer NOT NULL,