[doc] Attempt to fix autodoc on readthedocs

Lets see if this works..

doc/conf.py

@@ -19,7 +19,7 @@
 # If your extensions (or modules documented by autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.append(os.path.abspath('.'))
+sys.path.append(os.path.abspath('..'))
 
 # General configuration
 # ---------------------