Migration sql changes (#199)

* safe migration script changes

* lamassu migration script fixes

migrations/1536651947391-add-device-id-to-cash-out-actions.js

@@ -2,7 +2,7 @@ var db = require('./db')
 
 exports.up = function (next) {
   var sql = [
-    "alter table cash_out_actions add device_id text not null default ''"
+    db.addColumn('cash_out_actions', 'device_id', 'text not null default \'\'')
   ]
   db.multi(sql, next)
 }