Checklist

It would be easier to keep in single place things which we have to do
every time in specific states of the project as checklist which you can
easily review to not forget anything.

I moved some rules from our guidelines based on project states (initial,
moving to production) and added some more (e.g. binstubs flag).
fix: correct english
Remove binstubs flag
Merge pull request #69 from monterail/feature/checklist

Rails checklist