Rename PersonRating to just Person
Fix issue with the rake task

An error would be raised whenever you didn't specify the strategy.
This'll properly convert the strategy to a symbol only when it is
specified.
Merge branch 'rename_person_rating'
Restructure and make certain things protected

This will isolate responsibilities to the class that should be
responsible (mouthful...). Also some whitespace things, but that's less
important.
Refactor #update_recommendation

Most importantly, this will no longer presort recommendations, that's
now up to the developer.
Version bump to 0.2.0