Added name generation using seeds or custom random number generator

[GramThanos]

In some cases the ability to generate the same name based on a seed is needed, thus I added this functionality using a using a pseudorandom seedable number generator (using Antti Sykäri's algorithm from here)

The seeds can be used by passing a 2nd parameter:

const dockerNames = require('docker-names');
console.log(dockerNames.getRandomName(false, 'my-seed-here')); // Will always return the same name if the seed 'my-seed-here' is given
$ brave_ride

Also, support for custom random number generators was also added.

const dockerNames = require('docker-names');
console.log(dockerNames.getRandomName(false, {random : () => ((Math.random() + Math.random()) / 2)})); // Example of a custom random number generator
console.log(dockerNames.getRandomName(false, {random : () => 0.213456})); // Example of a not so random number generator (that will return determined_curie)

Or set it globally for all name generations

dockerNames.random_number_generator = {random : () => ((Math.random() + Math.random()) / 2)};
console.log(dockerNames.getRandomName());
console.log(dockerNames.getRandomName());