handle tuple & list version numbers

[lsternlicht]

No description provided.

[rasbt]

Thanks! Do you know a specific library that uses this format? I think it would good to add this as an example to the docs for testing. Maybe it's about time to setup unittests as well -- if that's possible with jupyter notebooks.

[jamesmyatt]

@rasbt , unit tests would be much easier if it wasn't so closely tied to IPython (e.g. #46, #60)