Implement mechanism to inject extra dependencies when the repl starts.

[pedro-w]

This is just a proposal on a method to implement #168 .
Tested on Windows and Fedora. I think the final version should be made optional based on the Package settings.

What do you think?

[birdspider]

Whats the status on this PR?

Also alternatively one could just prevent the proto-repl.leinArgs.split to split on the whitespace in the dep vector [x.z.y "0.1"] - i.e. this works:

atom.config.get('proto-repl.leinArgs').split(/\s+(?!\")/)

provided leinArgs is update-in :dependencies conj [proto-repl "0.3.1"] -- repl :headless

[pedro-w]

Closing because AFAICS neither this project nor Atom itself have much of a future.