Move sky-box,-button,-checkbox,-radio out of their directories

sky/framework/sky-box/sky-box.sky

Index: sky/framework/sky-box/sky-box.sky
diff --git a/sky/framework/sky-box/sky-box.sky b/sky/framework/sky-box/sky-box.sky
deleted file mode 100644
index 458ad40679dce3b8b971e4fc0750e2da136e81d3..0000000000000000000000000000000000000000
--- a/sky/framework/sky-box/sky-box.sky
+++ /dev/null
@@ -1,37 +0,0 @@
-<!--
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
--->
-<import src="/sky/framework/sky-element/sky-element.sky" as="SkyElement" />
-
-<sky-element name="sky-box" attributes="title:string">
-<template>
-  <style>
-    :host {
-      display: flex;
-      flex-direction: column;
-      border-radius: 4px;
-      border: 1px solid gray;
-      margin: 10px;
-    }
-    .title {
-      text-align: center;
-      font-size: 10px;
-      padding: 8px 8px 4px 8px;
-    }
-    .content {
-      padding: 4px 8px 8px 8px;
-    }
-    div {
-      flex: 1;
-    }
-  </style>
-  <div class="title">{{ title }}</div>
-  <div class="content"><content></content></div>
-</template>
-<script>
-module.exports = class extends SkyElement {
-}.register();
-</script>
-</sky-element>