Put most relevant methods at top of xpath class

lib/capybara/xpath.rb

@@ -28,6 +28,22 @@ module Capybara
       @paths = paths
     end
 
+    def scope(scope)
+      XPath.new(*paths.map { |p| scope + p })
+    end
+
+    def to_s
+      @paths.join(' | ')
+    end
+
+    def append(path)
+      XPath.new(*[@paths, XPath.wrap(path).paths].flatten)
+    end
+
+    def prepend(path)
+      XPath.new(*[XPath.wrap(path).paths, @paths].flatten)
+    end
+
     def from_css(css)
       append(Nokogiri::CSS.xpath_for(css).first)
     end
@@ -96,22 +112,6 @@ module Capybara
       add_field(locator, "//select", options)
     end
 
-    def scope(scope)
-      XPath.new(*paths.map { |p| scope + p })
-    end
-
-    def to_s
-      @paths.join(' | ')
-    end
-
-    def append(path)
-      XPath.new(*[@paths, XPath.wrap(path).paths].flatten)
-    end
-
-    def prepend(path)
-      XPath.new(*[XPath.wrap(path).paths, @paths].flatten)
-    end
-
     def checkbox(locator, options={})
       input_field(:checkbox, locator, options)
     end