Update What's New page to reflect v0.13 and move v0.12.x info to changelog
Docs: mention more available backports of stdlib packages
Fixed meta class for Python 3 form.
Merge pull request #90 from timster/patch-1

Fixed meta class for Python 3 form.
Update cheatsheet notebook
Update Py2/3 compatibility cheat-sheet
Add a script to enable colour in HTML produced from IPython notebooks
Add PDF link to compatibility cheatsheet notebook
Fix futurize -p and futurize -W.