Best practices and code style

[cuducos]

As suggested in #71:

I would like to suggest a minimum contribution guide with our agreement on code stye and best practices for this project.

Long story short my suggestions would be:

• ES6 compliant
• any consolidate code style guide
• something like Browserify and Babel to generate the browser/CDN .min.js (haven't checked the current gulpfile.js but maybe it's already there)

By consolidated I mean anything compatible with JSLlint. IMHO in spite f the semicolons I'd go with Airbnb.

What do you think about it? Here is how I plan to review this PR:

1. we could agree on something among these lines in terms of best practices and code style
2. we add that to README.md (or create CONTRIBUTING.md if it gets too long once again)
3. finally I'll have stuff other than my own opinion to dive into code

Hey @flaviosilveira, jump in!

[nandomoreirame]

Hey, @cuducos welcome back bro! 🤘

Yes! I approve your all suggestions and complement the check list:

• [ ] ES6 compliant ~> Maybe rewrite code with a version 2.0 using ES6
• [ ] Any consolidate code style guide ~> If rewrite core using ES6 we can use Browserify and Babel
• [ ] Any consolidate code style guide ~> If rewrite core using ES6 we can use Airbnb JavaScript Style Guide
• [ ] If we rewrite the core, I chose ESLint from JSLint
• [ ] And also... We can change the Gulp to Webpack or Browserify for automatization the tasks :)

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As for this Pull Request (#71), I think it's just to remove prototype files and implement some things from ES6 in GulpJS files...

We can continue this discussion for new projects ;)