env: Ensure proper detection of CircleCI
env: Ensure proper detection of CircleCI

This commit ensures all parameters required by the python [1] and bash [2] uploader can easily be passed to a docker container [3]

[1] https://github.com/codecov/codecov-python/blob/7386c3c13fc71f237611c780646fa1b44a07dc64/codecov/__init__.py#L337
[2] https://github.com/codecov/codecov-bash/blob/441e2018ed76f4d8cb92dafa732ee24ebebb41f9/codecov#L429
[3] http://docs.codecov.io/docs/testing-with-docker#section-codecov-inside-docker
codecov/codecov-bash,codecov/codecov-bash,codecov/codecov-bash,codecov/codecov-bash,codecov/codecov-bash,codecov/codecov-bash