Native remote connection support

[pfitzseb]

Still lots to do...

• Stop storing passphrase/password in plaintext
• Don't try to cd into a local path on startup
• Support for multiple servers.
• Fix interrupts. Kinda works now, but a general solution probably isn't possible since many ssh servers don't implement signal forwarding apparently.
• Error handling!
• Option for persistent julia process on server.
• Disconnect handling.
• Fix path issues on remote machine
• Better disconnect handling.
• Support for more complex ssh setups.
• Per-server config.

Also needs JunoLab/atom-ink#184 and h3imdall/ftp-remote-edit#228.

[pfitzseb]

Alright, this seems to work perfectly on all OSs I have access to. Would be cool to figure out whether this works on MacOS, but I don't think there's a reason it shouldn't.
I'm working on improving the UX a bit (see the checklist above), especially in regards to server management, but feel free to suggest improvements :)

[MikeInnes]

I'd like to see an alternative to the global boot setting for this; my best idea is to have a plain command, but we might be able to do something fancier / more automatic.

Also, in normal SSH sessions I rely on key forwarding (e.g. for github access), so that'd be nice to have.

[pfitzseb]

Also, in normal SSH sessions I rely on key forwarding (e.g. for github access), so that'd be nice to have.

Done, I think. Would be cool if you could try the latest commit.

I'd like to see an alternative to the global boot setting for this; my best idea is to have a plain command, but we might be able to do something fancier / more automatic.

Yeah, that's been annoying me a bit as well. Will add a command for now.

[MikeInnes]

Works great!

[pfitzseb]

Alright, I'll merge this now and try to fix the last couple of points tomorrow, but this should work well enough regardless.