Ignore environment variables for coffeelint
Summary: According to coffeelint --help, --noconfig ignores the environment variable COFFEELINT_CONFIG. This means that arc lint will behave more consistently across developer workstations by forcing configuration to be specified with coffeelint.config instead of with environment variables.
Test Plan: This is mostly theoretical.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11196