Fix python3 compatibility issues with doc fix

xbob/io/__init__.py

@@ -178,3 +178,6 @@ def get_include():
   """Returns the directory containing the C/C++ API include directives"""
 
   return __import__('pkg_resources').resource_filename(__name__, 'include')
+
+# gets sphinx autodoc done right - don't remove it
+__all__ = [_ for _ in dir() if not _.startswith('_')]