Implement many more nodes

Adds these new styling and formatting nodes
* strike
* highlight
* linebreaks
* pagebreaks
* Hyperlinks

test/formatting_test.rb

@@ -133,4 +133,49 @@ class FormattingTest < Minitest::Test
     assert_includes xml, "bold+italic "
     assert_includes xml, "all three"
   end
+
+  def test_strikethrough_text
+    xml = create_doc_and_read_xml do |doc|
+      doc.p do
+        doc.s { doc.text "strikethrough text" }
+      end
+    end
+
+    assert_includes xml, "<w:strike/>"
+    assert_includes xml, "strikethrough text"
+  end
+
+  def test_strikethrough_with_other_formatting
+    xml = create_doc_and_read_xml do |doc|
+      doc.p do
+        doc.b do
+          doc.s { doc.text "bold and strikethrough" }
+        end
+      end
+    end
+
+    assert_includes xml, "<w:b/>"
+    assert_includes xml, "<w:strike/>"
+    assert_includes xml, "bold and strikethrough"
+  end
+
+  def test_all_four_formatting_options
+    xml = create_doc_and_read_xml do |doc|
+      doc.p do
+        doc.b do
+          doc.i do
+            doc.u do
+              doc.s { doc.text "all four" }
+            end
+          end
+        end
+      end
+    end
+
+    assert_includes xml, "<w:b/>"
+    assert_includes xml, "<w:i/>"
+    assert_includes xml, '<w:u w:val="single"/>'
+    assert_includes xml, "<w:strike/>"
+    assert_includes xml, "all four"
+  end
 end