Add Javadoc documentation

[Hottemax]

Documentation will be needed once 1.0 rolls around

[OceanFlex]

You should honestly be updating javadoc all the time. Most people, myself included, don't want to bother with it more than once, but it still should be updated when you change something that would be documented. If one doesn't, it gets easy to forget about some method.

[Hottemax]

Marking as resolved, since such a generic issue is not helpful, and it is mostly done anyway.