cross-ci/lib/var/GIT_REMOTE.js

`cross-ci` standardizes environment variables for CI. For example, your can simply use `BUILD_BRANCH` variable in all CI runners instead of `CIRCLE_BRANCH` in CircleCI or `TRAVIS_PULL_REQUEST_BRANCH` in Travis.

/// Git remote used.
const GIT_REMOTE = () => 'origin';

module.exports = GIT_REMOTE;