return current_url for application (webdriver, culerity)

lib/capybara/driver/base.rb

@@ -1,4 +1,8 @@
 class Capybara::Driver::Base
+  def current_url
+    raise "Not implemented"
+  end
+
   def visit(path)
     raise "Not implemented"
   end

lib/capybara/driver/culerity_driver.rb

@@ -65,6 +65,10 @@ class Capybara::Driver::Culerity < Capybara::Driver::Base
     browser.html
   end
 
+  def current_url
+    browser.url
+  end
+  
   def find(selector)
     browser.elements_by_xpath(selector).map { |node| Node.new(self, node) }
   end

lib/capybara/driver/selenium_driver.rb

@@ -76,6 +76,10 @@ class Capybara::Driver::Selenium < Capybara::Driver::Base
     driver.page_source
   end
 
+  def current_url
+    driver.current_url
+  end
+
   def find(selector)
     driver.find_elements(:xpath, selector).map { |node| Node.new(self, node) }
   end

lib/capybara/dsl.rb

@@ -47,7 +47,7 @@ module Capybara
   end
 
   SESSION_METHODS = [
-    :visit, :body, :click_link, :click_button, :drag, :fill_in, :choose, :has_xpath?, :has_css?,
+    :visit, :current_url, :body, :click_link, :click_button, :drag, :fill_in, :choose, :has_xpath?, :has_css?,
     :check, :uncheck, :attach_file, :select, :has_content?, :within, :within_fieldset,
     :within_table, :save_and_open_page, :find, :find_field, :find_link, :find_button,
     :field_labeled, :all, :wait_for, :evaluate_script, :click, :click_element

lib/capybara/session.rb

@@ -21,6 +21,10 @@ module Capybara
       end
     end
 
+    def current_url
+      driver.current_url
+    end
+    
     def visit(path)
       driver.visit(path)
     end