Allow multiple configuration blocks without dropping previous configuration.

If you really want to start with a default configuration use:

  Webrat.configure(Webrat::Configuration.new) do |config|
    ...
  end

lib/webrat/core/configuration.rb

@@ -4,7 +4,7 @@ module Webrat
 
   # Configures Webrat. If this is not done, Webrat will be created
   # with all of the default settings.
-  def self.configure(configuration = Webrat::Configuration.new)
+  def self.configure(configuration = Webrat.configuration)
     yield configuration if block_given?
     @@configuration = configuration
   end

spec/private/core/configuration_spec.rb

@@ -34,6 +34,20 @@ describe Webrat::Configuration do
     config.should_not open_error_files
   end
 
+  it "should be configurable with multiple blocks" do
+    Webrat.configure do |config|
+      config.open_error_files = false
+    end
+    
+    Webrat.configure do |config|
+      config.selenium_server_port = 1234
+    end
+
+    config = Webrat.configuration
+    config.should_not open_error_files
+    config.selenium_server_port.should == 1234
+  end
+  
   [:rails,
   :selenium,
   :rack,