Rebase of PR 170

[josecelano]

Hi @WarmBeer, I've rebased your PR, fixing all merge conflicts.

Do you want to rewrite the history of your changes or can we merge it as it's is?

Now you can rewrite your commits if you want to, with the following:

git reset develop
git add -A 
git commit -m "isolated configuration, test-helpers and primitives crates"
git push --force

As you mentioned here.

[mickvandijke]

Thank you @josecelano !

it can be merged as is :)

[josecelano]

ACK 4ad9815