Made s.cd change to an only-child of an entity if no arguments are passed.
Added a key plugin (which works well with s.cd).
Kept a reference to the actual index of the entity.
Allowed s.get to return s..index.
Added a work-in-progress index plugin.
The index argument is retarded when using s.find.
Utilized s..index for the true index instead, but this is not intuitive in all cases either.