Fix twitter stream under python 3

This fixes the "AttributeError: '_io.BufferedReader' object has no attribute '_sock'" error when trying to create a twitter stream with python3.

There are two issues (#70 and #108) that are fixed with this commit.

I have written a twitter script in python 3 with your twitter lib so I would be really glad if you can merge this and then create a new point release of the lib.

That way I can release the script without having to tell the users to manually patch the twitter lib.

I'm sorry if you've already read my reply to #108. But I would really like this to get merged and released ASAP.