Added sample mysql scheme
Added more comments
Attributes now return as objects
Created EAV_Attribute object
Added comments to EAV_Attribute class
Restructured the whole thing
Added proper comments
Updated constants to reflect changes
Attributes are now fetched from the DB in a single query
Fixed bugs with updating/inserting
Minor fixes to EAV class
Added 'modified' flag to EAV_Attribute to prevent saving when it's not necessary
Fixed directly selecting object from ORM::factory
Fixed loading attributes
Added delete_attribute function
Merge branch 'develop-3.3' into master-3.3