Curl FTP adapter

[simoheinonen]

https://github.com/vyuldashev/flysystem-curlftp

It doesn't seem to be the most popular adapter out there but it's very useful when you have to access an FTP through a proxy from Heroku for example where the IPs change often.

Do you think this could get merged if I work on in?

[simoheinonen]

I suppose this is enough for me: https://github.com/1up-lab/OneupFlysystemBundle/blob/master/Resources/doc/adapter_custom.md

[bytehead]

Sure, any contribution is very welcome :)
Feel free to provide a pull request!

[bytehead]

I'll reopen the issue just to have it on the list of features.