Add controller generator feature

Author: vivekmiyani

features/generator_specs/controller_specs.feature

@@ -0,0 +1,43 @@
+Feature: Controller generator spec
+
+    Scenario: Controller generator
+        When I run `bundle exec rails generate controller posts`
+        Then the features should pass
+        Then the output should contain:
+          """
+                create  app/controllers/posts_controller.rb
+                invoke  erb
+                create    app/views/posts
+                invoke  rspec
+                create    spec/requests/posts_spec.rb
+                invoke  helper
+                create    app/helpers/posts_helper.rb
+                invoke    rspec
+                create      spec/helpers/posts_helper_spec.rb
+                invoke  assets
+                invoke    css
+                create      app/assets/stylesheets/posts.css
+          """
+
+    Scenario: Controller generator with customized `default-path`
+        Given a file named ".rspec" with:
+          """
+          --default-path behaviour
+          """
+        And I run `bundle exec rails generate controller posts`
+        Then the features should pass
+        Then the output should contain:
+          """
+                create  app/controllers/posts_controller.rb
+                invoke  erb
+                create    app/views/posts
+                invoke  rspec
+                create    behaviour/requests/posts_spec.rb
+                invoke  helper
+                create    app/helpers/posts_helper.rb
+                invoke    rspec
+                create      behaviour/helpers/posts_helper_spec.rb
+                invoke  assets
+                invoke    css
+                create      app/assets/stylesheets/posts.css
+          """