Feature request: unpublish multiple about legit

[weakish]

It is possible to implement this feature but I am a bit unsure about the API design.

Currently legit only supports git unpublish foo, then it is quite obvious foo is a branch name.

But what does git unpublish foo bar mean?

1. unpublish both foo and bar branch?
2. unpublish branch foo from bar remote?
3. (less likely) unpublish branch bar from foo remote?

Also, pr #242 may allow legit to specify remote as a command/verb argument.

Currently legit have neither "multiple branches" nor "multiple remote" concept.
I think we need to examine thoughtfully about whether and how to introduce these concepts.

[frostming]

This feature introduces ambiguity to the CLI API, hence I am -1 on this. Close it for now. Feel free to reopen if you have any better idea on this.