Overwrite require() in a project but exclude node_modules

Nobody has claimed this yet.

I'm thinking about ways one might incorporate [ramda-t](https://github.com/raine/ramda-t) in development process without too much hassle.

One of those I've considered is conditionally overwriting require in non-production environment so that if you `require('ramda')` instead of vanilla Ramda you'd get `ramda-t`.

In order for this to be a feasible approach, the `require` overwrite should only apply to the project's own files.

I know based on the README that `really-need` can be used to overwrite `require` in the way I described, but I also understood that it would apply to global scope and affecting all dependencies as well.

Start with the README's existing description of require overwriting and inspect how really-need applies it to dependencies. Investigate whether the behavior can be limited to the project's own files while excluding node_modules. Done means a documented, feasible approach or an implementation that scopes the overwrite as requested.

Written by the indexing model from the issue text.