Add a transpiler (Babel/TypeScript/etc)

[bluzi]

Currently the library is written using ES5 standards, for backward compatibility reasons.
I would like to use ES2015 standards and still maintain the support for older browsers, so I think Babel/TypeScript would be a good solution.

Feel free to create a PR that solves it using Babel, TypeScript or any other solution you think is best. (You can also discuss possible solutions here)

[matheushf]

I'll check it out!

[bluzi]

Thanks!

[charrondev]

I've added a PR for this #8 using TypeScript and Babel (babel as needed to generate a UMD bundle with the export being assigned to window).