extended sys.path in conf.py for rtd build

Author: krfricke

docs/conf.py

@@ -19,6 +19,7 @@
 import os
 import sys
 sys.path.insert(0, os.path.abspath('.'))
+sys.path.insert(1, os.path.abspath('..'))
 
 # import CommonMark
 from recommonmark.transform import AutoStructify