Create api to check the routing number

We need an 'api' to return if the routing number is correct and it should also return the bank name.

- [ ] Create routing_number migration to create table
- [ ] Import RoutingNumber model from Neighbor.ly
- [ ] Create model specs
- [ ] Create routing number controller to get bank name
- [ ] Import rake task from Neighbor.ly to update routing numbers
- [ ] Create JS to show the bank name