enable CHROME_HEADLESS environment variable for Spinach tests similar to RSpec
enable CHROME_HEADLESS environment variable for Spinach tests similar to RSpec

iiet/iiet-git,stoplightio/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,dreampet/gitlab,mmkassem/gitlabhq