move upload image in IMUtil
move upload image in IMUtil

pjyin/JLWeChat-iPhone,jimneylee/JLWeChat-iPhone,LijieSong/JLWeChat-iPhone,jimneylee/JLWeChat-iPhone,pjyin/JLWeChat-iPhone,jimneylee/JLWeChat-iPhone,LijieSong/JLWeChat-iPhone,jimneylee/JLWeChat-iPhone