Improve generating the minified code

[Arkkimaagi]

I noticed that the minified code did not get updated when I did the improvement to support multiple trigger buttons.

As I could not find documentation on how it's generated, I created this pull request to use uglify-js for minifying via npm script. I also added a bit of documentation so that others would not have to wonder as much how to contribute.

• Add uglify-js to minify javascript
• Add npm run uglify script to generate the minified (and unminified version for debugging) version
• Add contribution documentation
• Bump up version number to 3.4.1

[Arkkimaagi]

Maybe after this a new release could be created?

[scottaohara]

hey again.

Actually, I've been meaning to just delete the minified JS so that people could just use whatever minification / build process they want to.

[Arkkimaagi]

I think removing the minified version might be a bad idea.

If you check the google inert code, it too has minified code for ready use.

People might want to just get the minified version directly without always building a minifying workflow to their system. This way people do not have to build their own tooling for simple use cases.

This pull request is about having a simple tooling in the project for minifying the code automatically helps with contributions.

[scottaohara]

i understand the intent of the PR. It just conflicts with what I was planning on doing here.

I'll think on it.

However, i definitely don't see value in copying over the unminified index.js file into the assets folder.

[Arkkimaagi]

Yep, maybe copying the unminified can be removed. Usually when you concatenate several scripts to one, it's a good idea to create so I did it out of habit. But here the need for that is not as clear.