Passing config using environment variables

Hello,

I'm using Travis-CI for Continuous Integration in many projects.
I'm planning to use traitlets as a way to configure some tools (passing API_KEY, ...)

To be able to test my projects, I need to pass some settings using environnement variables (only for Continuous Integration) because it's necessary to "hide" (from Git repository) some config data (API_KEY, password...)

see http://docs.travis-ci.com/user/environment-variables/

Is it something which is possible with traitlets ?
Is it something which could be considered in traitlets ?

Kind regards