Add support for several ftps

[greg0ire]

It would be nice to be able to define several ftp connections instead of just one.

[touki653]

That has been in my mind for a while yet. Unfortunetely I don't have much time to support this just yet. But this will be added later on, for sure!

[greg0ire]

I'm glad to hear that!

[banstola]

I have to make connection to several ftp connections one after another and the build method returns the instance with the base_uri that was used previously.