Add xpath query for input type=button into XPath.button

lib/capybara/xpath.rb

@@ -69,9 +69,9 @@ module Capybara
     end
 
     def button(locator)
-      xpath = append("//input[@type='submit' or @type='image'][@id=#{s(locator)} or contains(@value,#{s(locator)})]")
+      xpath = append("//input[@type='submit' or @type='image' or @type='button'][@id=#{s(locator)} or contains(@value,#{s(locator)})]")
       xpath = xpath.append("//button[@id=#{s(locator)} or contains(@value,#{s(locator)}) or contains(.,#{s(locator)})]")
-      xpath = xpath.prepend("//input[@type='submit' or @type='image'][@value=#{s(locator)}]")
+      xpath = xpath.prepend("//input[@type='submit' or @type='image' or @type='button'][@value=#{s(locator)}]")
       xpath = xpath.prepend("//button[@value=#{s(locator)} or text()=#{s(locator)}]")
     end
 

spec/views/form.erb

@@ -138,6 +138,7 @@
   </div>
 
   <p>
+    <input type="button" name="form[fresh]" id="fresh_btn" value="i am fresh"/>
     <input type="submit" name="form[awesome]" id="awe123" value="awesome"/>
     <input type="submit" name="form[crappy]" id="crap321" value="crappy"/>
     <input type="image" name="form[okay]" id="okay556" value="okay"/>

spec/xpath_spec.rb

@@ -166,6 +166,10 @@ describe Capybara::XPath do
       @driver.find(@query).first.value.should == 'click_me'
       @query = @xpath.button('Click me!').to_s
       @driver.find(@query).first.value.should == 'click_me'
+      @query = @xpath.button('fresh_btn').to_s
+      @driver.find(@query).first.value.should == 'i am fresh'
+      @query = @xpath.button('i am fresh').to_s
+      @driver.find(@query).first[:name].should == 'form[fresh]'
     end
   end