Templates for homepage and markdown posts.

Signed-off-by: HE, Tao <sighingnow@gmail.com>

_includes/toc-date.html

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+<div class="book-summary">
+    <div id="book-search-input" role="search">
+        <input type="text" placeholder="Type to search" />
+    </div>
+    <nav role="navigation">
+        <ul class="summary">
+            {% if page.url == "/index.html" or page.url == "/" %}
+            <li class="chapter active" data-level="1.1" data-path="{{site.url}}">
+            {% else %}
+            <li class="chapter" data-level="1.1" data-path="{{site.url}}">
+            {% endif %}
+                <a href="{{site.url}}">
+                    {{ site.title | escape }}
+                </a>
+            </li>
+
+            <li class="divider"></li>
+
+            {% assign reversed_posts = site.posts | reverse %}
+
+            {% for post in reversed_posts %}
+                {% if page.url == post.url %}
+                <li class="chapter active" data-level="1.2" data-path="{{post.url}}">
+                {% else %}
+                <li class="chapter" data-level="1.1" data-path="{{post.url}}">
+                {% endif %}
+                    <a href="{{post.url}}">
+                        {{ post.title | escape }}
+                    </a>
+                </li>
+            {% endfor %}
+
+            <li class="divider"></li>
+
+            <li>
+                <a href="https://github.com/sighingnow/jekyll-gitbook" target="blank" class="gitbook-link">
+                    Fork it Now!
+                </a>
+            </li>
+        </ul>
+    </nav>
+</div>