Enable ESLint and fix minor code style stuff in project_variables.js.es6.
Enable ESLint and fix minor code style stuff in project_variables.js.es6.

openwide-java/gitlabhq,darkrasid/gitlabhq,dplarson/gitlabhq,iiet/iiet-git,openwide-java/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,LUMC/gitlabhq,htve/GitlabForChinese,dplarson/gitlabhq,axilleas/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,t-zuehlsdorff/gitlabhq,iiet/iiet-git,LUMC/gitlabhq,dreampet/gitlab,jirutka/gitlabhq,dreampet/gitlab,LUMC/gitlabhq,dreampet/gitlab,jirutka/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,openwide-java/gitlabhq,darkrasid/gitlabhq,dplarson/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,darkrasid/gitlabhq,htve/GitlabForChinese,iiet/iiet-git,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,openwide-java/gitlabhq,htve/GitlabForChinese,axilleas/gitlabhq,darkrasid/gitlabhq,LUMC/gitlabhq,dplarson/gitlabhq