Add a 'report a bug' link on doc

docs/_templates/breadcrumbs.html

@@ -0,0 +1,24 @@
+{# Support for Sphinx 1.3+ page_source_suffix, but don't break old builds. #}
+
+{% if page_source_suffix %} 
+{% set suffix = page_source_suffix %}
+{% else %}
+{% set suffix = source_suffix %}
+{% endif %}
+
+<div role="navigation" aria-label="breadcrumbs navigation">
+  <ul class="wy-breadcrumbs">
+    <li><a href="{{ pathto(master_doc) }}">Docs</a> &raquo;</li>
+      {% for doc in parents %}
+          <li><a href="{{ doc.link|e }}">{{ doc.title }}</a> &raquo;</li>
+      {% endfor %}
+    <li>{{ title }}</li>
+      <li class="wy-breadcrumbs-aside">
+        {% if pagename != "search" %}
+            <a href="https://github.com/gpocentek/python-gitlab/blob/{{ github_version }}{{ conf_py_path }}{{ pagename }}{{ suffix }}" class="fa fa-github"> Edit on GitHub</a>
+            | <a href="https://github.com/gpocentek/python-gitlab/issues/new?title=Documentation+bug&body=%0A%0A------%0AIn+page:+{{ pagename }}{{ suffix }}">Report a bug</a>
+        {% endif %}
+      </li>
+  </ul>
+  <hr/>
+</div>