Long running tests process because of search inside all node_modules installed

I get a long running process searching for all modules that have a ```build.json``` file. 
This PR checks the path of the modules parsed to not include the node_modules ones.

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As in my other pr #96, all tests pass correctly
```bash
npm test -f
```
(in order to pass the linting errors) makes the tests pass:
```
✓ OK » 84 honored (0.015s) 
```