Big rewrite (maybe)

[caarlos0]

I'm thinking about supporting any kind of bundle types.

For that to work, we would have basically a core api and a zsh api (initially), than we could add a path api (to add the bundle folder to PATH, for example), and fish api, and whatever we want...

the main api usage should look like:

antibody.New(bundles).Bundle()

which should return a string with all shell commands that should run: source path/a.zsh; export PATH="path_b/:$PATH" etc

[caarlos0]

done