bin/mach-bhj: add script to build rpm for fedora20

Signed-off-by: Bao Haojun <baohaojun@gmail.com>
bin/cowbuilder-bhj: fix link error for ww
bin/daily-build-ww: fix .spec file error, add rpm build
bin/mach-bhj: ww rpm build ok for fedora

Signed-off-by: Bao Haojun <baohaojun@gmail.com>