Support dokku cli

[morizyun]

Hi Steve,

I've recently moved from Heroku to Dokku, but love Figaro's approach to configuration management, so I've added some initial support for Figaro to push configurations to a Dokku app.

This pull request includes code, specs and documentation updates - hope this is useful. It's my first rodeo with Thor so I've based it on your Heroku code, and I'm sure there are improvements to be made.

(It's late, so I'll skip the animated gif!)

Regards, morizyun

[joshco]

I like this. It works for me using dokku-client on win10x64 talking to a linux dokku server.

[morizyun]

thanks!

[scarroll32]

I'm looking forward to seeing this merged!

[scarroll32]

Will this be merged?

[beauraF]

Hey, is it possible to merge this ? :D Great feature !