python 3 compatibility

[mentaal]

Hi there, the python_3 branch does not appear to be fully compatible with python 3. Below is a on the python_3 branch

Traceback (most recent call last):
  File "web.py", line 10, in <module>
    import post
  File "/home/gkuhn/flask-blog/post.py", line 45
    except Exception, e:
                ^
SyntaxError: invalid syntax