Add bower_components for direct downloads but ignore them when installing using npm or bower

bower_components/select2/docs/_includes/examples/tokenizer.html

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+<section>
+  <h1 id="tokenizer">Automatic tokenization</h1>
+
+  <p>
+    Select2 supports ability to add choices automatically as the user is
+    typing into the search field. Try typing in the search field below and
+    entering a space or a comma.
+  </p>
+
+  <p>
+    The separators that should be used when tokenizing can be specified
+    using the <a href="options.html#tokenSeparators">tokenSeparators</a>
+    options.
+  </p>
+
+  <div class="s2-example">
+    <p>
+      <select class="js-example-tokenizer form-control" multiple="multiple">
+        <option>red</option>
+        <option>blue</option>
+        <option>green</option>
+      </select>
+    </p>
+  </div>
+
+{% highlight js linenos %}
+$(".js-example-tokenizer").select2({
+  tags: true,
+  tokenSeparators: [',', ' ']
+})
+{% endhighlight %}
+</section>