create rubinius gemset only when not ignoring gemsets, fix #2283
save md5 with url instead of archive, update #2284
fix overwriting system type
move rubinius md5 to full url to prevent file name conflict between source and binary file, update #2284
handle rubinius binaries content after forcing rbx name, fix #2284
improved warning when missing ruby in rubygems_detect_ruby_lib_gem_path
change found remote file to log, update #2284
change scripts to be executable, fix f7b24ac