Support for SFTP protocol about remote-ftp

[grenierdev]

Looks like node-sftp require sftp & ssh process to be available in the path. That's a bummer. Will need to find an other implementation that uses pure NodeJS.

[felixphew]

If SFTP isn't supported, why are there options called secure and secureOptions?

[theRichu]

SFTP and FTPS are NOT the same
FTPS means FTP over SSL(think about http and https!) but SFTP is SSH File Transfer Protocol,
It's basically diffrent protocol.

[felixphew]

OK, this is a little unclear. I would maybe change "secure" to "ssl"? And maybe something in the README that says SFTP isn't supported, as it seems to be pretty much standard nowadays.

[jpstrikesback]

Pure JS implementation: https://github.com/mscdex/ssh2

[grenierdev]

I rewrote the plugin to support multiple "connector" (FTP, SFTP). I'm finishing up the other bugs & features and will look into adding an SFTP connector using SSH2.