Add initial models and corresponding test files

app/models/address.rb

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+class Address < ActiveRecord::Base
+  belongs_to :contact
+  belongs_to :country
+end

app/models/contact.rb

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+class Contact < ActiveRecord::Base
+  has_many :addresses
+end

app/models/country.rb

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+class Country < ActiveRecord::Base
+
+end

app/models/domain.rb

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+class Domain < ActiveRecord::Base
+  belongs_to :registrar
+  belongs_to :ns_set
+  belongs_to :owner_contact, class_name: 'Contact'
+  belongs_to :technical_contact, class_name: 'Contact'
+  belongs_to :admin_contact, class_name: 'Contact'
+end

app/models/nameserver.rb

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+class Nameserver < ActiveRecord::Base
+  has_and_belongs_to_many :ns_sets
+end

app/models/ns_set.rb

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+class NsSet < ActiveRecord::Base
+  belongs_to :registrar
+  has_many :domains
+  has_and_belongs_to_many :nameservers
+end

app/models/registrar.rb

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+class Registrar < ActiveRecord::Base
+  belongs_to :country
+  has_many :domains
+  has_many :ns_sets
+end

app/models/right.rb

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+class Right < ActiveRecord::Base
+  has_and_belongs_to_many :roles
+end

app/models/role.rb

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+class Role < ActiveRecord::Base
+  has_many :users
+  has_and_belongs_to_many :rights
+end

app/models/user.rb

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+class User < ActiveRecord::Base
+  belongs_to :role
+end