Remove private code from public libWrapper scope

[ruipin]

Currently, the global libWrapper class exposes a lot of underlying code (methods that start with _) that probably shouldn't be available in global scope.

If I have some time, it might be useful to move these methods off to a private scope that is not exposed to the world. Additionally, it might make sense for the release versions to minify any method name starting in _.

[ruipin]

As discussed in #28, the module "Better Rolls" is accessing private APIs they probably shouldn't. As such, this issue is essentially blocked by that one, and any changes here will need to be discussed with them, otherwise their module will break.

[ruipin]

This is now done in v1.4.0.0, closing.

Better Rolls has also been updated to use the newly documented API discussed in #28.