bin/.files: add `ssh` for sftp to work in `lftp`; cygwin 1.7.15;

* add to engines this great tool:
LFTP | Version 4.3.7 | Copyright (c) 1996-2012 Alexander V. Lukyanov

* cygwin 1.7.15 as listed in package.json already, update files

Signed-off-by: Oleg Verych <olecom@gmail.com>