Resolving local/nested node_modules folder

[Chido]

There are cases that arise when a node module specifies it's own node_modules folder (for instance when wanting to tie itself to a particular version of a package). Example below:

./
├── app.js
└── node_modules
    └── packageA
        ├── index.js
        └── node_modules
            └── child_packageA
                └── index.js

In the case above, requiring

 dependencyTree({
        "app.js",
        "./",
        isListForm: true
      });

should return the dependencies

[
 "./node_modules/packageA/index.js",
 "./node_modules/packageA/node_modules/child_packageA/index.js"
]

which is does not.

---

Another issue is that if the base node_modules has a version of child_packageA, it will refer to that as a dependency, which is wrong (and can have adverse effects if it is a different version of the package). For instance

./
├── app.js
└── node_modules
    ├── child_packageA
    │   └── index.js
    └── packageA
        ├── index.js
        └── node_modules
            └── child_packageA
                └── index.js

Returns

[
 "./node_modules/packageA/index.js",
 "./node_modules/child_packageA/index.js"
]

---

The main issue is related to the directory used when passing a file to precient to get the dependencies. When the file is part of node module/package, the directory should be the root of that package (as all files are contained in there)

Pull request #162 is a potential fix for this.