* Remove unused "js-yaml" dependency (Miroslav Bajtoš)
 * Remove unused "opener" dependency (Miroslav Bajtoš)
 * Update shelljs to latest (Miroslav Bajtoš)
 * Update debug to latest (Miroslav Bajtoš)
 * Update underscore.string to latest (Miroslav Bajtoš)
 * Update chai to latest (Miroslav Bajtoš)
 * Update mocha to latest (Miroslav Bajtoš)
 * Upgrade express to latest (Miroslav Bajtoš)
 * Upgrade glob to latest (Miroslav Bajtoš)
 * Drop support for Node.js version pre-4.0 (Miroslav Bajtoš)