Recurly improved their error messages: and broke our tests

[MarkDBlackwell]

Apparently Recurly has changed (further differentiated) some error messages. So, this has broken two of our tests.

But the tests pass when (in sign_up_with_recurly.feature) the strings respectively in lines 56 and 72 are changed to:

'Billing info verification value must be three digits'

and

'Your card was declined'.

These lines flow into the rails_apps_composer only near here.