tools: update eslint to v2.2.0
update eslint from v2.1.0 to v2.2.0 for new features and bug fixes
blog: http://eslint.org/blog/2016/02/eslint-v2.2.0-released
changelog: https://github.com/eslint/eslint/blob/master/CHANGELOG.md
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
update eslint from v2.1.0 to v2.2.0 for new features and bug fixes
blog: http://eslint.org/blog/2016/02/eslint-v2.2.0-released
changelog: https://github.com/eslint/eslint/blob/master/CHANGELOG.md