1. change excuable bundle identity version and build

2. zip the excualbe

3. sign it with dsa private key
   ~/Sparkle/bin/sign_update Smine.zip ~/baidu_yun/百度云同步盘/kpan/dsa/dsa_priv.pem

4. ls the zip file size

5. update the cast xml , version , length, sign

##To test update Use python -m SimpleHTTPServer 8080