Update gems

I ran `bundle update` to update the gems before upgrading to Rails 4.1.
All the tests pass so we should be good.
Use `get` instead of `match`

These routes only need to respond to GET. This becomes an error in
Rails 4.1 so I'm proactively changing it. The error in 4.1 is:

> You should not use the `match` method in your router without
specifying an HTTP method.