文件同步工具：gko_pool

currently p2p algorithm is complete, could be used for data transfer.
usage see --help
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# Start project gingko
# Gingko is a point to point rsync rolling checksum proto-
# col implemented file synchronize application. Instead
# of original rsync builds, we want to make it able to 
# sync files from a large mesh computer network so-called 
# the cloud and pushing files from computers to computers,
# the P2P protocol will make it more efficient.
# Hope it success!

#define Rolling_checksum_algorithm http://samba.anu.edu.au/rsync/tech_report/node3.html

BUILD:
    make

NOTE：
    For reusing some code between clnt and serv, I write some funcs in gingko_common.h
with some MACRO, I know this is ugly, but the bins compiled out work well...so, let it
be.

DEPS:
    libevent
    gtest (when ./configure --enable-unittest)

from https://github.com/auxten/gko_pool/tree/master/src