Enhance visit() pattern to support multiple paths

[dtognazzini]

The "visit" pattern is described here:
https://github.com/appfolio/ae_page_objects#adding-a-path
https://github.com/appfolio/ae_page_objects#navigation

An example:

class LoginPage < AePageObjects::Document
  path :new_session
end

# navigates to /session/new
login_page = LoginPage.visit

Some pages can be visited by multiple paths. For example:

Capybara.current_session.visit("/autologin/access?token=#{token}")
login_page = AePageObjects.browser.current_window.change_to(LoginPage)

It would be convenient to allow for this scenario while keeping the path specification on the page. Perhaps something like:

class LoginPage < AePageObjects::Document
  path :new_session
  path :access_autologin
end

# navigates to /session/new
login_page = LoginPage.visit

# navigates to "/autologin/access?token=#{token}"
login_page = LoginPage.visit(token: token, via: :access_autologin)

The second use of visit specifies which path to use via the :via option. All other arguments are forwarded to the configured router.