Add cuba/capybara for backward compatibilty.
Add cuba/capybara for backward compatibilty.

Existing users of cuba/test shouldn't be penalized too much.
The easiest solution of course is to offer them a one-line
require to get the old behavior back if they need it.

`require "cuba/capybara"` gives them this.

mikz/roda,janko-m/roda,johan--/roda,Freaky/roda,mikz/roda,janko-m/roda,jeremyevans/roda,anthonymiyoro/cuba,kematzy/roda,duykhoa/roda,anthonymiyoro/cuba,duykhoa/roda,johan--/roda,Freaky/roda,kematzy/roda,kematzy/roda,rkh/cuba,Freaky/roda,jeremyevans/roda,duykhoa/roda,soveran/cuba,soveran/cuba,celsworth/roda,johan--/roda,janko-m/roda,celsworth/roda,hilpitome/cuba,mikz/roda,jeremyevans/roda,celsworth/roda,hilpitome/cuba