Cleanup package.json and CONTRIBUTING.md.

The master branch has been in flux for a pretty long time, so leaving
the broken npm scripts and messages in CONTRIBUTING.md doesn't make
sense and has been confusing to contributors. This commit removes broken
npm scripts and removes all unnecessary dependencies for now.

.github/CONTRIBUTING.md

@@ -25,15 +25,13 @@ Before submitting a request, please search for similar ones in the
 
 ## Pull Requests
 
-For additions or bug fixes you should only need to modify `lodash.js`. Include
-updated unit tests in the `test` directory as part of your pull request. Don’t
-worry about regenerating the `dist/` or `doc/` files.
+For additions or bug fixes, please modify the relevant files. Include
+updated unit tests in the `test` directory as part of your pull request.
+Unit test files should be named `[filename].test.js`.
 
 Before running the unit tests you’ll need to install, `npm i`,
 [development dependencies](https://docs.npmjs.com/files/package.json#devdependencies).
-Run unit tests from the command-line via `npm test`, or open `test/index.html` &
-`test/fp.html` in a web browser. The [Backbone](http://backbonejs.org/) &
-[Underscore](http://underscorejs.org/) test suites are included as well.
+Run unit tests from the command-line via `npm test`.
 
 ## Contributor License Agreement