add 'polymer-ui-elements.html' import to match polymer-* convention and to include some doc data (ref Polymer/polymer-docs/#1 )

Author: Scott J. Miles

polymer-ui-elements.html

@@ -0,0 +1,40 @@
+<!--
+/**
+ *
+ * Single import for loading the standard set of `polymer-ui-*` elements.
+ *
+ * Example:
+ *
+ *     <!-- load numerous polymer-ui elements -->
+ *     <link rel="import" href="components/polymer-ui-elements/polymer-ui-elements.html">
+ *
+ * @class polymer-ui-elements
+*/
+-->
+<link rel="import" href="../polymer-ui-accordion/polymer-ui-accordion.html">
+<link rel="import" href="../polymer-ui-arrow/polymer-ui-arrow.html">
+<link rel="import" href="../polymer-ui-breadcrumbs/polymer-ui-breadcrumbs.html">
+<link rel="import" href="../polymer-ui-card/polymer-ui-card.html">
+<link rel="import" href="../polymer-ui-collapsible/polymer-ui-collapsible.html">
+<link rel="import" href="../polymer-ui-dropdown/polymer-ui-dropdown.html">
+<link rel="import" href="../polymer-ui-dropup/polymer-ui-dropup.html">
+<link rel="import" href="../polymer-ui-field/polymer-ui-field.html">
+<link rel="import" href="../polymer-ui-icon/polymer-ui-icon.html">
+<link rel="import" href="../polymer-ui-icon-button/polymer-ui-icon-button.html">
+<link rel="import" href="../polymer-ui-menu/polymer-ui-menu.html">
+<link rel="import" href="../polymer-ui-menu-button/polymer-ui-menu-button.html">
+<link rel="import" href="../polymer-ui-menu-item/polymer-ui-menu-item.html">
+<link rel="import" href="../polymer-ui-nav-arrow/polymer-ui-nav-arrow.html">
+<link rel="import" href="../polymer-ui-overlay/polymer-ui-overlay.html">
+<link rel="import" href="../polymer-ui-pages/polymer-ui-pages.html">
+<link rel="import" href="../polymer-ui-ratings/polymer-ui-ratings.html">
+<link rel="import" href="../polymer-ui-scaffold/polymer-ui-scaffold.html">
+<link rel="import" href="../polymer-ui-sidebar/polymer-ui-sidebar.html">
+<link rel="import" href="../polymer-ui-sidebar-header/polymer-ui-sidebar-header.html">
+<link rel="import" href="../polymer-ui-sidebar-menu/polymer-ui-sidebar-menu.html">
+<link rel="import" href="../polymer-ui-splitter/polymer-ui-splitter.html">
+<link rel="import" href="../polymer-ui-submenu-item/polymer-ui-submenu-item.html">
+<link rel="import" href="../polymer-ui-tabs/polymer-ui-tabs.html">
+<link rel="import" href="../polymer-ui-theme-aware/polymer-ui-theme-aware.html">
+<link rel="import" href="../polymer-ui-toggle-button/polymer-ui-toggle-button.html">
+<link rel="import" href="../polymer-ui-toolbar/polymer-ui-toolbar.html">