support Tree & add dispatch and broadcast methods

support Tree，many component add name $option；add dispatch and broadcast
methods, mixins it

test/app.vue

@@ -30,6 +30,7 @@ li + li { border-left: solid 1px #bbb; padding-left: 10px; margin-left: 10px; }
                 <li><router-link to="/upload">Upload</router-link></li>
                 <li><router-link to="/collapse">Collapse</router-link></li>
                 <li><router-link to="/carousel">Carousel</router-link></li>
+                <li><router-link to="/tree">Tree</router-link></li>
             </ul>
         </nav>
         <router-view></router-view>

test/main.js

@@ -84,6 +84,10 @@ const router = new VueRouter({
         {
             path: '/carousel',
             component: require('./routers/carousel.vue')
+        },
+        {
+            path: '/tree',
+            component: require('./routers/tree.vue')
         }
     ]
 });

test/routers/tree.vue

@@ -1,10 +1,12 @@
 <template>
-    <Tree
-        :data.sync="treeData"
-        :show-checkbox="true"
-        :multiple="true"
-        @on-select-change="selectFn"
-        @on-check-change="checkFn"></Tree>
+    <div>
+        <Tree
+            v-model="treeData"
+            :show-checkbox="true"
+            :multiple="true"
+            @on-select-change="selectFn"
+            @on-check-change="checkFn"></Tree>
+    </div>
 </template>
 <script>
     export default {