Easy spacing fixes, trailing stuff

Remove useless trailing \
Remove trailing spaces
Add missing empty lines

autopep8 -ir -j2 --select=E301,E302,E502,W291,W293,W391 .

Diff quickly checked.

modules/aum/captcha.py

@@ -26,8 +26,10 @@ try:
 except ImportError:
     raise ImportError('Please install python-imaging')
 
+
 class CaptchaError(Exception): pass
 
+
 class Tile(object):
     hash = {
         'bc8d52d96058478a6def26226145d53b': 'A',
@@ -115,6 +117,7 @@ class Tile(object):
             print 'hash: %s' % checksum
             raise CaptchaError()
 
+
 class Captcha(object):
     def __init__(self, f):
         self.img = Image.open(f)
@@ -156,6 +159,7 @@ class Captcha(object):
             s += tile.letter
         return s
 
+
 class Decoder(object):
     def __init__(self):
         self.hash = {}