Add link support to mediawiki grammer. Fix a bug in rr.Node()

test.js

@@ -81,3 +81,19 @@ QUnit.test('singleline-wikichunk', function(assert) {
   var iterable = context.rules['wikidoc'].match(context);
   assert.equal(iterable.next().value.nodes[0].innerHTML, expected);
 });
+
+QUnit.test('Link', function(assert) {
+  assert.expect(1);
+  var content = [
+    "[[http://www.example.com/foo|Test text ''with formatting'']]"
+  ].join('\n');
+
+  var expected = [
+    '<p><a><href>http://www.example.com/foo</href>',
+    'Test text <i>with formatting</i></a></p>'
+  ].join('');
+
+  var context = new rr.Context(mediawiki, content);
+  var iterable = context.rules['wikidoc'].match(context);
+  assert.equal(iterable.next().value.nodes[0].innerHTML, expected);
+});