Upgrade to Nightwatch 1.x

[stennie]

Consider upgrading to Nightwatch 1.0:

A significant update from previous 0.x versions featuring a complete rewrite of the entire codebase and also including some new features. The main focus has been on improving the underlying architecture, therefore this release includes mostly fixes and improvements, but also a few brand new features.

• Release notes: https://github.com/nightwatchjs/nightwatch/releases
• Upgrade guide: https://github.com/nightwatchjs/nightwatch/wiki/Migrating-to-Nightwatch-1.0