0.1.0
  First commit

0.1.1
  Comment the alias method enum_attr

0.1.2
  Fixed a bug

0.1.3
  Comment the validation method validates_inclusion_of

0.2.0
  Add alias method enum_attr for acts_as_enum
  Rename acts_as_enum options :enum to :in

1.0.1
 Options :in value is Array, can be have two or three elements

1.0.2
  Fixed a bug for #{boolean_column_attr}_name method
