Make ModuleFinder work for symlinked packages
Make ModuleFinder work for symlinked packages

I'm working in a project (happo-target-firefox) which has a dependency
to another package, symlinked in a parent folder. To make importing
these work, we need to pretend that they're in the local node_modules
folder.

trotzig/import-js,Galooshi/import-js,trotzig/import-js,trotzig/import-js