Make value attribute for color input conform to HTML spec

http://www.whatwg.org/specs/web-apps/current-work/multipage/number-state.html#color-state
http://www.w3.org/TR/html-markup/input.color.html

lib/capybara/spec/session/click_button_spec.rb

@@ -52,7 +52,7 @@ shared_examples_for "click_button" do
         end
 
         it "should serialise and submit color fields" do
-          @results['html5_color'].should == '#FFF'
+          @results['html5_color'].should == '#FFFFFF'
         end
       end
 

lib/capybara/spec/views/form.erb

@@ -335,7 +335,7 @@
   </p>
   <p>
     <label for="html5_color">Html5 Color</label>
-    <input type="color" name="form[html5_color]" value="#FFF" id="html5_color"/>
+    <input type="color" name="form[html5_color]" value="#FFFFFF" id="html5_color"/>
   </p>
   
   <p>