Update env vars when booting locally with heroku settings
Update env vars when booting locally with heroku settings

- Add GITHUB_REPO_READ_TOKEN for repo validation

- Add GITHUB_REPO_STATUS_WRITE_TOKEN for posting commit statuses

- Use foreman long options for readability

FundingCircle/shipment_tracker,FundingCircle/shipment_tracker,FundingCircle/shipment_tracker,FundingCircle/shipment_tracker