python3.3 & 3.4 support

Hi Jeff, 

I couldn't help myself but to revamp all the tests, merging it in  a single file and get rid of the string comparison it makes in all the doctesting. Now it simply shows it in the terminal.  

I bump the version and include the changes in the CHANGES.txt file. If you please, include your changes, AFAIK ZPL licence requires to do so. 

I'll love to see it in pypy updated, I can try to reach John. J Lee if you want.