[1.9.x] Ignored new warnings when building the docs with Sphinx 1.4.

# Python's docs don't change every week.

intersphinx_cache_limit = 90  # days

# The 'versionadded' and 'versionchanged' directives are overridden.

suppress_warnings = ['app.add_directive']

# -- Options for HTML output ---------------------------------------------------

# The theme to use for HTML and HTML Help pages.  See the documentation for