Merge pull request #820 from ethereum/fixDocs

fix Docs

docs/conf.py

@@ -21,6 +21,7 @@ import os
 # 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.insert(0, os.path.abspath('.'))
+from recommonmark.transform import AutoStructify
 from recommonmark.parser import CommonMarkParser
 source_parsers = {'.md': CommonMarkParser}