v0.1.3,  2014-10-24 -- Add optional per-file callback to add_dir
v0.1.2,  2014-10-23 -- Make test SFTP server more manageable
v0.1.1,  2014-10-23 -- Add sftpsyncer.test as package
v0.1.0,  2014-10-20 -- Initial release
