Script to migrate django sessions to python social auth

[tomgruner]

This is a handy script that could help in migrating from the old facebook backend to the new one. Maybe it could be added as an example to the migration docs? I might be missing something too, if there are other changes between the backends.

https://gist.github.com/tomgruner/5ce8bb1f4c55d17b5b25

Thanks for the great work on python social auth!

[omab]

@tomgruner, thanks for writing that script, I've added a similar version in the docs here http://psa.matiasaguirre.net/docs/configuration/porting_from_dsa.html#session and also linked to your original version.