Dump .jar content.
% ./build.sh
Note that this is tentative.
% ./jar-dump.sh JarDump.jar -c
/com/github/hidenorly/jardump/OptParse.class
/com/github/hidenorly/jardump/OptParse$OptParseItem.class
/com/github/hidenorly/jardump/JarDump.class
/com/github/hidenorly/jardump/FileLister.class