Add webpack to get a compiled version of luminave

[TimPietrusky]

In order to use luminave in other browsers, we have to add a transpiler like webpack to get an ES5 version.

Even if the other browser doesn't support WebUSB, you can use the other integrations.

[TimPietrusky]

We can generate a compiled version of luminave by using:

npm run build

This will generate everything into the docs folder.

[TimPietrusky]

The build is broken: #79