bkeepers/dotenv — pull request #133 by surfacedamage (2014-09-19 18:01:04+00:00)
Title: Preserve customized .env when overloading

This resolves https://github.com/bkeepers/dotenv-deployment/issues/13

`overload()` should not push the .env onto the `filenames` stack if is empty. See issue link above for more detail.