[FEATURE] Model generator attributes accept `default{value}` setting.

== Addons

* `default{value}` key added to the model scaffolder.
  $ hexx model NAME -a active:boolean:default{true}

* `factory_girl` added to default .gemspec domain template.
* `factory_girl.rb` initializer added to `spec/initializers` domain templates.

== Bugs fixed

* `self.table_name` explicit definition included to model template.
* loading order changed in the `spec_helper.rb` domain template.

== Version

Patch 1.0.3 released (minor features added within current release).