Switch settings from file to module WIP
Restore Django's manage.py
Import dev settings
Import tests settings
Add concrete to base settings (ref #674)
Add Environment/Ini reader (ref #681)
Add helpers for ini reader (ref #681)
Move settings from buildout to geotrek.settings.default (ref #674, #681)
Move prod settings from buildout to geotrek.settings.prod (ref #674, #681)