Redirect a maximum of 5 times instead of time limit, closes #67

This is as per http://www.ietf.org/rfc/rfc2068.txt

"A user agent SHOULD NOT automatically redirect a request
more than 5 times, since such redirections usually indicate an
infinite loop."

lib/capybara/driver/rack_test_driver.rb

@@ -249,10 +249,8 @@ private
   end
 
   def follow_redirects!
-    Capybara::WaitUntil.timeout(4) do
-      redirect = response.redirect?
-      follow_redirect! if redirect
-      not redirect
+    5.times do
+      follow_redirect! if response.redirect?
     end
   rescue Capybara::TimeoutError
     raise Capybara::InfiniteRedirectError, "infinite redirect detected!"