pep8 blank lines fixes

flake8 --select W391,E302,E301,E304

autopep8 can't fix W391 even though it claims it can.
Fixed using a simple custom script.

modules/cragr/mobile/pages/tokenextractor.py

@@ -20,6 +20,7 @@
 
 class TokenExtractor(object):
     """ Extracts texts token from an HTML document """
+
     def __init__(self):
         self.iterated_elements = []