Add httpsession-xml

Fixes #103

samples/httpsession-xml/src/integration-test/groovy/sample/pages/HomePage.groovy

@@ -0,0 +1,30 @@
+package sample.pages
+
+import geb.*
+
+/**
+ * The home page
+ *
+ * @author Rob Winch
+ */
+class HomePage extends Page {
+    static url = ''
+    static at = { assert driver.title == 'Session Attributes'; true}
+    static content = {
+        form { $('form') }
+        submit { $('input[type=submit]') }
+        createAttribute(required:false) { name, value ->
+            form.attributeName = name
+            form.attributeValue = value
+            submit.click(HomePage)
+        }
+        attributes { moduleList AttributeRow, $("table tr").tail() }
+    }
+}
+class AttributeRow extends Module {
+    static content = {
+        cell { $("td", it) }
+        name { cell(0).text() }
+        value { cell(1).text() }
+    }
+}