Requirements upgrade:
Requirements upgrade:

- rollback `django-pipeline` to 1.3.x, because 1.4 breaks tags names and I'm not sure we will ever need to switch to 1.4.
- reorder them to match `pip freeze | sort` output.
- add missing deps.
- upgrade a lot of python deps.

1flow/1flow,1flow/1flow,1flow/1flow,1flow/1flow,1flow/1flow