ignore .pipcache
Allow booting as much as possible without raven/sentry, for 1flow instances which don't have it.
Load the first database content at the end of bootstrap, else the Django project won't start.
Refresh dot.env.example with current production branch values.
Add a quick installation documentation, to have something in between now and the "one-line-docker-install".
bump version for hotfix 0.26.4.1
Merge branch 'hotfix/0.26.4.1'