Prune trailing whitespaces from code and documentation

They are redundant in all pruned cases and sometimes even create some
problems, e.g., when one tries to jump through paragraphs in vi.

Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>

offlineimap/imaplib2.py

@@ -1330,7 +1330,7 @@ class IMAP4(object):
             self.ouq.put(rqb)
             return rqb
 
-        # Must setup continuation expectancy *before* ouq.put 
+        # Must setup continuation expectancy *before* ouq.put
         crqb = self._request_push(tag='continuation')
 
         self.ouq.put(rqb)
@@ -2442,7 +2442,7 @@ if __name__ == '__main__':
             run('id', ())
             run('id', ('("name", "imaplib2")',))
             run('id', ("version", __version__, "os", os.uname()[0]))
- 
+
         for cmd,args in test_seq2:
             if (cmd,args) != ('uid', ('SEARCH', 'SUBJECT', 'IMAP4 test')):
                 run(cmd, args)