Fixed bug when attribute is named 'to'. Fixed checking editable?

[miry]

When model has field to factory Enum was always because it checks on method name to_enum and this method is defined in Object.

Also fixed bug for rails 4 when try to edit record or create a new one, it invokes a mass assignment method active_authorizer and this method were removed from the rails 4.

[coveralls]

Coverage decreased (-18.13%) when pulling 91cc15c on jetthoughts:remove_mass_assignment into 37dacd4 on sferik:rails-4.

[coveralls]

Coverage increased (+0.04%) when pulling e726972 on jetthoughts:remove_mass_assignment into 37dacd4 on sferik:rails-4.

[coveralls]

Coverage increased (+0.04%) when pulling e726972 on jetthoughts:remove_mass_assignment into 37dacd4 on sferik:rails-4.