Bump to 3.1.0.rc1.
Bump to 3.1.0.rc1.

CHANGELOG

- Do a deep clone of the settings object during inheritance.
- Start namespacing plugins (i.e. settings[:render]).
- Use rack/test when doing `require 'cuba/test'`.
- Capybara available via `require 'cuba/capybara'`
- Use a default hash for the render plugin.

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