Add bower_components as it contains the resources used by github pages.

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

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+<section>
+
+  <h1 id="placeholders">Placeholders</h1>
+
+  <p>
+    A placeholder value can be defined and will be displayed until a
+    selection is made. Select2 uses the <code>placeholder</code> attribute
+    on multiple select boxes, which requires IE 10+. You can support it in
+    older versions with
+    <a href="https://github.com/jamesallardice/Placeholders.js">the Placeholders.js polyfill</a>.
+  </p>
+
+  <div class="s2-example">
+    <p>
+      <select class="js-example-placeholder-single js-states form-control">
+        <option></option>
+      </select>
+    </p>
+    <p>
+      <select class="js-example-placeholder-multiple js-states form-control" multiple="multiple"></select>
+    </p>
+  </div>
+
+  <pre data-fill-from=".js-code-placeholder"></pre>
+
+<script type="text/javascript" class="js-code-placeholder">
+$(".js-example-placeholder-single").select2({
+  placeholder: "Select a state",
+  allowClear: true
+});
+
+$(".js-example-placeholder-multiple").select2({
+  placeholder: "Select a state"
+});
+</script>
+
+</section>