Rename mdv -> template_binding, remove experiemntal apis from dart:html

pkg/mdv/lib/src/element.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of mdv;
-
-/** Extensions to the [Element] API. */
-class _ElementExtension extends _NodeExtension {
-  _ElementExtension(Element node) : super(node);
-
-  // TODO(jmesserly): should path be optional, and default to empty path?
-  // It is used that way in at least one path in JS TemplateElement tests
-  // (see "BindImperative" test in original JS code).
-  NodeBinding createBinding(String name, model, String path) =>
-      new _AttributeBinding(node, name, model, path);
-
-  // Normally we issue this error in Element._ensureTemplate, but we
-  // avoid calling that from the model getter, so issue the error here.
-  get model => throw new UnsupportedError('$node is not a template.');
-}
-
-class _AttributeBinding extends NodeBinding {
-  final bool conditional;
-
-  _AttributeBinding._(node, name, model, path, this.conditional)
-      : super(node, name, model, path);
-
-  factory _AttributeBinding(Element node, name, model, path) {
-    bool conditional = name.endsWith('?');
-    if (conditional) {
-      node.xtag.attributes.remove(name);
-      name = name.substring(0, name.length - 1);
-    }
-    return new _AttributeBinding._(node, name, model, path, conditional);
-  }
-
-  Element get node => super.node;
-
-  void boundValueChanged(value) {
-    if (conditional) {
-      if (_toBoolean(value)) {
-        node.xtag.attributes[property] = '';
-      } else {
-        node.xtag.attributes.remove(property);
-      }
-    } else {
-      // TODO(jmesserly): escape value if needed to protect against XSS.
-      // See https://github.com/polymer-project/mdv/issues/58
-      node.xtag.attributes[property] = sanitizeBoundValue(value);
-    }
-  }
-}