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.

- [x] Create routing_number migration to create table
- [x] Import RoutingNumber model from Neighbor.ly
- [x] Create model specs
- [x] Create routing number controller to get bank name
- [x] Import rake task from Neighbor.ly to update routing numbers
- [x] Create JS to show the bank name
- [x] Update README to say about the rake task
- [x] Update Travis CI to work with the database