improve project with doc and control
Merge pull request #81 from gbaty/dynamic_project_preview

Dynamic project preview
Merge pull request #78 from jucoste/improve_tuto_koch

Improve project tutorial_models (Koch)
Fix error at runing lpy model:
    plantgl search openalea.oalab.plugins.control.ControlWidgetSelectorPlugin that is now at openalea.core.plugin.control.ControlWidgetSelectorPlugin
Merge pull request #82 from jucoste/fix_lpy

Fix error at runing lpy model / plantgl
Follow flake8
Simplify code