gextech/grunt-nightwatch — pull request #19 by narenb (2014-08-14 21:37:37+00:00)
Title: default configuration values were not merged with other extended environments.

As per documentation from nightwatch http://nightwatchjs.org/guide#config-test-settings:
A "default" environment is required. All the other environments are derived from default and their settings can be overridden as needed.