Made Capybara work with standalone rake apps.

Default Capybara to using a Sauce Connect port.

Moved Capybara configuration logic into the Sauce::Capybara module, then
called it from sauce/capybara (delicious testing).

Set Capybara.always_include_port to true for local Rack applications.

Added Capybara to connect integration gemfile.
Merge pull request #199 from DylanLacey/master

Made Capybara work with standalone rake apps.