Python 2 compatibility fixes

FileExistsError to IOError

wikilabbook/__init__.py

@@ -22,7 +22,7 @@ if not os.path.isfile(TEMPLATE_PATH):
     import pkg_resources
     try:
         os.makedirs(config_path)
-    except FileExistsError:
+    except (IOError, OSError):
         pass
 
     package_path = os.path.dirname(os.path.realpath(__file__))