Resolve "require" modules relative to project directory

[novemberborn]

See #2971 (comment):

I think we should resolve relative to the project directory, likely we're trying to approximate that with resolve-cwd but the CWD doesn't have to be the project directory. I'd classify this as a bug, actually.

This is needed so that we import the expected module, without say AVA's dependencies shadowing it.

We may be able to use nodejs.org/api/module.html#modulecreaterequirefilename with the project directory and use the resolve() method on that.

[novemberborn]

#3184 loads the module from a file inside the project, which achieves the goal of this issue.