Use footer to inject Piwik markup

Workaround for https://github.com/rtfd/readthedocs.org/issues/152Signed-off-by: Michal Čihař <michal@cihar.com>

docs/_templates/piwik.html → docs/_templates/footer.html

+{% include "!footer.html" %}
+
 {% if READTHEDOCS %}
 <!-- Piwik -->
 <script type="text/javascript">

docs/conf.py

@@ -146,9 +146,7 @@ html_static_path = ['_static']
 #html_use_smartypants = True
 
 # Custom sidebar templates, maps document names to template names.
-html_sidebars = {
-    '**': 'piwik.html',
-}
+#html_sidebars = {}
 
 # Additional templates that should be rendered to pages, maps page names to
 # template names.
@@ -335,3 +333,7 @@ epub_exclude_files = ['search.html']
 
 # If false, no index is generated.
 #epub_use_index = True
+
+import sphinx_rtd_theme
+html_theme = 'sphinx_rtd_theme'
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]