Merge tag 'sparks-1.5.1' into develop

1.5.1
useless import removed.
Add the django sparks module, with the `fabfile` part (already used in beau-dimanche project).
default “ start-from-scratch ” requirements file. Hope I will be able to keep it updated from all my Django projects…
empty settings module.
readability.
Merge branch 'release/1.6'