Add messages import back to open_humans/views.py
Add messages import back to open_humans/views.py

Pylint fooled me - said it wasn't used, but it was wrong.

PersonalGenomesOrg/open-humans,PersonalGenomesOrg/open-humans,PersonalGenomesOrg/open-humans,OpenHumans/open-humans,OpenHumans/open-humans,PersonalGenomesOrg/open-humans,OpenHumans/open-humans,OpenHumans/open-humans