implement FastDFS storage service with go.
1.download FastDFSv2.13 from google code
2.cd FastDFS && patch -Np1 fastdfsv2.13.patch
3.modify CFLAGS in shm.go depend on your FastDFS source directory
3.go build storage.go shm.go
4.run fdfs_storage && storage
implement FaceBook's picture storage Haystack