v5.1.0

• Added: "Did you mean?" style error message to help with typos in association declarations
• Changed: NoMethodError for static attributes now offers a "Did you mean?" style message
• Fixed: avoid undefining inherited evaluator methods
• Fixed: avoid stubbing id for records without a primary key
• Fixed: raise a helpful error for self-referencing traits to avoid a SystemStackError
• Deprecated: top-level methods meant only for internal use: allow_class_lookup, allow_class_lookup=, register_trait, trait_by_name, traits, sequence_by_name, sequences, factory_by_name, register_factory, callback_names, register_callback, register_default_callbacks, register_default_strategies, strategies