Use minimist instead of optimist / Use chai.assert.include for testing

* I replaced [optimist](https://github.com/substack/node-optimist) with [minimist](https://github.com/substack/minimist) because [optimist is deprecated](https://github.com/substack/node-optimist#deprecation-notice).
* I introduced `chai.assert.include()` for response checking. It is clearer than `chai.assert.isTrue(_.contains(actual, expected))`.
* I added `"use strict";` to the example scripts.
* I updated [lodash](https://www.npmjs.org/package/lodash) module.