Pass environment through to go language programs

[justone]

This allows those programs to use authentication credentials that are
in the environment to perform extra work.

[justone]

There are, of course, security implications for passing through the entire environment, especially in light of the scenario where someone is running a stack binary that they didn't create themselves (i.e. purchased from someone or downloaded from github).

[swgillespie]

There are, of course, security implications for passing through the entire environment, especially in light of the scenario where someone is running a stack binary that they didn't create themselves (i.e. purchased from someone or downloaded from github).

Our threat model has been that a user's program is entirely trusted, since the user should be in control of their own system. I think this is fine if we assume that model.

[swgillespie]

LGTM, thank you!