Main: Do not globally catch unknown errors
Main: Do not globally catch unknown errors

Better terminate with stack trace for debugging, at least until
version 1.0.

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