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/web/pages.py

@@ -39,6 +39,7 @@ class HomePage(Page):
 
         return None
 
+
 class LoginPage(Page):
     def login(self, password):
         assert password.isdigit()
@@ -60,12 +61,15 @@ class LoginPage(Page):
     def get_result_url(self):
         return self.parser.tocleanstring(self.document.getroot())
 
+
 class UselessPage(Page):
     pass
 
+
 class LoginErrorPage(Page):
     pass
 
+
 class _AccountsPage(Page):
     COL_LABEL    = 0
     COL_ID       = 2
@@ -223,12 +227,15 @@ class CardsPage(Page):
 
             yield t
 
+
 class AccountsPage(_AccountsPage):
     pass
 
+
 class SavingsPage(_AccountsPage):
     COL_ID       = 1
 
+
 class TransactionsPage(Page):
     def get_next_url(self):
         links = self.document.xpath('//span[@class="pager"]/a[@class="liennavigationcorpspage"]')