Add NavPanel.

src/components/nav_panel/nav_panel.js

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+const NavPanel = {
+}
+
+export default NavPanel

src/components/nav_panel/nav_panel.vue

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+<template>
+  <div class="nav-panel">
+    <div class="panel panel-default">
+      <ul>
+        <li ng-if='currentUser'>
+          <router-link to='/main/friends'>
+            Timeline
+          </router-link>
+        </li>
+        <li>
+          <router-link to='/main/public'>
+            Public Timeline
+          </router-link>
+        </li>
+        <!-- <li>
+             <router-link to='/main/all'>
+             The Whole Known Network
+             </router-link>
+             </li> -->
+      </ul>
+    </div>
+  </div>
+</template>
+
+<script src="./nav_panel.js" ></script>
+
+<style lang="scss">
+
+ .nav-panel ul {
+     list-style: none;
+     margin: 0;
+     padding: 0;
+ }
+
+ .nav-panel li {
+     border-bottom: 1px solid silver;
+     padding: 0.5em;
+     padding-left: 1em;
+ }
+
+ .nav-panel li:last-child {
+     border: none;
+ }
+
+ .nav-panel a {
+     display: block;
+     width: 100%;
+
+     &.router-link-active {
+         font-weight: bold
+     }
+ }
+
+</style>