remove eval in favour of const_get
Merge branch 'habtm' of github.com:m3talsmith/arkenstone into habtm
Tying in has_and_belongs_to_many relationships
Setup foreign model join methods for grabbing foreign join instances
Setup caching for foreign join instances
Inserts the opposite foreign join object when using <<
[Example] beer.tags << tag # Adds tag to beer.tags and beer to tag.beers