test-util: Allow single test cases being run from nodeunit-standalone.js
test-util: Allow single test cases being run from nodeunit-standalone.js

pozdnyakov/crosswalk-app-tools,hgl888/crosswalk-app-tools,davidmaxwaterman/crosswalk-app-tools,davidmaxwaterman/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools,baleboy/crosswalk-app-tools,pozdnyakov/crosswalk-app-tools,shawngao5/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools,hgl888/crosswalk-app-tools,shawngao5/crosswalk-app-tools,baleboy/crosswalk-app-tools,baleboy/crosswalk-app-tools