Release v0.4.0

Added

• Fields may be declared with serialize: true or serialize: <serializeable-class>, where <serializeable-class>
  may be Array (Array stored as YAML) or Hash (Hash stored as YAML), (Array or Hash or any scalar value stored as JSON)
  or any custom serializable class.
  This invokes ActiveSupport's serialize macro for that field, passing the serializable class, if given.

  Note: when serialize: is used, any default: should be given in a matching Ruby type--for example, [] or {} or { 'currency' => 'USD' }--in
  which case the serializeable class will be used to determine the serialized default value and that will be set as the SQL default.

Fixed

• Sqlite now correctly infers the PRIMARY KEY so it won't attempt to add that index again.