Install dependency from a private server

[mario-eth]

Currently, soldeer can download and install any dependency that is public under a zip archive.
Would be awesome to have a way to also install private dependencies, this mostly for under development projects that are developing under the radar until the smart contracts are released.

Maybe a way to do this is to have in the install command a way to specify a user/pass/token to pull the dependency using OAuth maybe from a certain link?

Another possibility to overcome this is to have private repositories in soldeer central repository but for that we need a bit more research.

[beeb]

This is now possible with git dependencies. Not sure we need more?