title: Running Capybara without rack produces errors when using url parameters
body: <p>Here's my setup, based on this recommendation: <a href="https://stackoverflow.com/questions/15665106/how-to-get-cucumber-capybara-mechanize-to-work-against-external-non-rails-site">How to get Cucumber/Capybara/Mechanize to work against external non-rails site</a></p>
  
  <p>It works until I add parameters to the URL. Any advice on addressing this issue?</p>
  
  <pre><code>require 'rspec'
  require 'capybara/rspec'
  require 'capybara/dsl'
  
  @test_url = "test"
  
  RSpec.configure do |config|
    config.include Capybara::DSL
  end
  
  Capybara.configure do |config|
    config.run_server = false
    config.current_driver = :selenium
    config.app = "fake app name"
    config.app_host = "http://site.com/#{@test_url}"
  end
  </code></pre>
  
  <p>This works fine: </p>
  
  <pre><code>describe "the page, without URL parameters" do
    it "shows the regular form" do
      visit "/registration.aspx"
      page.should have_content "YES"    
    end
  end
  </code></pre>
  
  <p>But this: </p>
  
  <pre><code>describe "the page, when not fully pre-filled" do
    it "shows the regular form if only passed the attendance" do
      visit "/registration.aspx?r=y"
      page.should have_content "YES"    
    end
  
    it "shows the regular form if only passed the attendance" do
      visit "/registration.aspx?f=Jim"
      page.should have_content "YES"    
    end
  
  end
  </code></pre>
  
  <p>results in </p>
  
  <pre><code>....FF
  
  Failures:
  
    1) the page, when not fully pre-filled shows the regular form if only passed the attendance
       Failure/Error: visit "/registration.aspx?r=y"
       NoMethodError:
         undefined method `call' for "fake app name":String
       # ./conf_spec.rb:39:in `block (2 levels) in &lt;top (required)&gt;'
  
    2) the page, when not fully pre-filled shows the regular form if only passed the attendance
       Failure/Error: visit "/registration.aspx?f=Jim"
       NoMethodError:
         undefined method `call' for "fake app name":String
       # ./conf_spec.rb:44:in `block (2 levels) in &lt;top (required)&gt;'
  </code></pre>