Allow model custom field names

See http://bmidget.github.io/kohana-formo/orm.html#nonmodelfields for more information on how to use custom field names.

Trait no longer uses _call

3.1.3

Trait no longer uses _call magic method

3.1.2

Use the correct alias for custom Formo_ORM relationships

Formo_ORM trait

Deprecated Formo::orm() in favor of more usable, and much more powerful Formo_ORM trait.

Composer support

3.0

Fix vendor name