[YMK] ftp mode: add lcd, lls, lpwd
[YMK] ftp mode: refine remote ls
[YMK] ftp mode: remote cd, ls, pwd
[YMK] ftp mode: add pull, and download google documents as pdfs
[YMK] ftp mode: add transfor push
[YMK] ftp mode: add remote command trash
[YMK] release 0.2.0 with mvp fpt mode