Initial Codecov Circleci Orb

This release marks the beginning of the Codecov CircleCI Orb.

The orb currently supports 5 parameters:

1. file (Required): The filename of the report to upload
2. conf: The filename of the configuration yaml to read (defaults to .codecov.yml)
3. flags: A comma separated list of flags (Read more about flags)
4. token: Codecov private token (defaults to environment variable $CODECOV_TOKEN)
5. upload_name: Custom defined name of the upload (defaults to $CIRCLE_BUILD_NUM)

Find more documentation on the orb
Read more about CircleCI Orbs