安装好小乌龟git后，用小乌龟的pull 从github上拉取项目，遇到错误：
disconnected no supported authentication methods available(server sent: publickey)
或者是 git did not exit cleanly (exit code 1)
亦或者是 git did not exit cleanly (exit code 128)
因为TortoiseGit和Git的冲突。 改正如下：
设置TortoiseGit > Settings > Network > SSH Client为C:\Program Files\Git\usr\bin\ssh.exe
