Marking variables private via JSDOC annotations

[doubleactii]

In the generated docs there are a lot of variables that are marked public when they are in fact private. Mark them private in JSDOC annotation and this should make the docs smaller and easier to read/parse.

This will clear up confusion with maintainers and contributors in the future. This will also clear up confusion with users of the module as they will no longer try to access variables that shouldn't be accessible.