Mix into corresponding RSpec example groups

Why:

* Currently, our matchers are mixed into every example group under
  RSpec.
* This creates a problem because some gems, such as
  active_model_serializers-matchers, provide matchers that are named
  the same as the ones that we provide.

To satisfy the above:

* Only mix matchers that correspond to a particular Rails module into
  the appropriate example group for that module. In detail:
    * Mix ActiveModel and ActiveRecord matchers into model example
      groups.
    * Mix ActionController matchers into controller example groups.

lib/shoulda/matchers/integrations/libraries/action_controller.rb

@@ -10,7 +10,7 @@ class ActionController
           include Integrations::Rails
 
           def integrate_with(test_framework)
-            test_framework.include(matchers_module)
+            test_framework.include(matchers_module, type: :controller)
 
             include_into(::ActionController::TestCase, matchers_module) do
               def subject

lib/shoulda/matchers/integrations/libraries/active_model.rb

@@ -10,7 +10,7 @@ class ActiveModel
           include Integrations::Rails
 
           def integrate_with(test_framework)
-            test_framework.include(matchers_module)
+            test_framework.include(matchers_module, type: :model)
             include_into(ActiveSupport::TestCase, matchers_module)
           end
 

lib/shoulda/matchers/integrations/libraries/active_record.rb

@@ -10,7 +10,7 @@ class ActiveRecord
           include Integrations::Rails
 
           def integrate_with(test_framework)
-            test_framework.include(matchers_module)
+            test_framework.include(matchers_module, type: :model)
             include_into(ActiveSupport::TestCase, matchers_module)
           end
 

lib/shoulda/matchers/integrations/test_frameworks/active_support_test_case.rb

@@ -9,7 +9,7 @@ class ActiveSupportTestCase
           def validate!
           end
 
-          def include(*modules)
+          def include(*modules, **options)
             test_case_class.include(*modules)
           end
 

lib/shoulda/matchers/integrations/test_frameworks/minitest_4.rb

@@ -9,7 +9,7 @@ class Minitest4
           def validate!
           end
 
-          def include(*modules)
+          def include(*modules, **options)
             test_case_class.class_eval do
               include(*modules)
               extend(*modules)

lib/shoulda/matchers/integrations/test_frameworks/minitest_5.rb

@@ -10,7 +10,7 @@ class Minitest5
           def validate!
           end
 
-          def include(*modules)
+          def include(*modules, **options)
             test_case_class.class_eval do
               include(*modules)
               extend(*modules)

lib/shoulda/matchers/integrations/test_frameworks/missing_test_framework.rb

@@ -23,7 +23,7 @@ def validate!
 EOT
           end
 
-          def include(*modules)
+          def include(*modules, **options)
           end
 
           def n_unit?

lib/shoulda/matchers/integrations/test_frameworks/rspec.rb

@@ -9,9 +9,9 @@ class Rspec
           def validate!
           end
 
-          def include(*modules)
+          def include(*modules, **options)
             ::RSpec.configure do |config|
-              config.include(*modules)
+              config.include(*modules, **options)
             end
           end
 

lib/shoulda/matchers/integrations/test_frameworks/test_unit.rb

@@ -9,7 +9,7 @@ class TestUnit
           def validate!
           end
 
-          def include(*modules)
+          def include(*modules, **options)
             test_case_class.class_eval do
               include(*modules)
               extend(*modules)

spec/unit/shoulda/matchers/active_model/allow_value_matcher_spec.rb

@@ -1,6 +1,6 @@
 require 'unit_spec_helper'
 
-describe Shoulda::Matchers::ActiveModel do
+describe Shoulda::Matchers::ActiveModel, type: :model do
   describe '#allow_values' do
     it 'is aliased to #allow_value' do
       expect(method(:allow_values)).to eq(method(:allow_value))