add CECA settings, until we have a dedicated repository for them.
version bump for 0.28.2.3.
Merge branch 'release/0.28.2.3' into develop
Move ipynb from dev- to requirements. Even production needs it.
version bump for 0.28.2.4.
Merge branch 'release/0.28.2.4' into develop
Fix http://dev.1flow.net/ceca/1flow/group/42990/