Switch from Godep to go vendoring

vendor/github.com/russross/blackfriday/testdata/Tabs.html

@@ -0,0 +1,26 @@
+<ul>
+<li><p>this is a list item
+indented with tabs</p></li>
+
+<li><p>this is a list item
+indented with spaces</p></li>
+</ul>
+
+<p>Code:</p>
+
+<pre><code>this code block is indented by one tab
+</code></pre>
+
+<p>And:</p>
+
+<pre><code>    this code block is indented by two tabs
+</code></pre>
+
+<p>And:</p>
+
+<pre><code>+   this is an example list item
+    indented with tabs
+
++   this is an example list item
+    indented with spaces
+</code></pre>