the better 502.html for nginx when the Django app is down.
More infrastructure documentation.
version bump for 0.26.2.3.
Merge branch 'release/0.26.2.3' into develop
Update MAIN_SERVER -> DBCACHE_SERVER because of now-splitted settings in different containers in production.
version bump for 0.26.2.4.
Merge branch 'release/0.26.2.4' into develop
Switch to celery 3.1.9, sparks 3.10 (for pip cache), and keep only one celery dependancy to be sure to always have latest ones (via Django-celery).
Switch to sparks 3.10.1.
Switch to sparks 3.10.2.