Update the install destination of javascript to use vendor

It is not possible to configure the Rails application to not use the
asset pipeline in newer versions of Rails, so that setting has been
removed.

Additionally, we can install the javascript provided by the gem into the
vendor directory in the Rails app, so that the user can customize it if
needed.

lib/generators/paul_revere/paul_revere_generator.rb

@@ -7,26 +7,22 @@ class PaulRevereGenerator < Rails::Generators::Base
   source_root File.join(File.dirname(__FILE__), "templates")
 
   def install
-    copy_javascript if needs_js_copied?
+    copy_javascript
     migration_template "migration.rb", "db/migrate/create_announcements.rb"
   end
 
   private
 
   def copy_javascript
-    copy_file File.join(javascript_path, 'announcements.js'), js_destination
+    copy_file File.join(javascript_path, "announcements.js"), javascript_destination
   end
 
   def javascript_path
     File.join(%w(.. .. .. .. app assets javascripts))
   end
 
-  def needs_js_copied?
-    !::Rails.application.config.assets.enabled
-  end
-
-  def js_destination
-    'public/javascripts/announcements.js'
+  def javascript_destination
+    "vendor/assets/javascripts/announcements.js"
   end
 
   def self.next_migration_number(dirname)

spec/lib/generators/paul_revere/paul_revere_generator_spec.rb

@@ -11,7 +11,7 @@
     run_generator
   end
 
-  specify do
+  it "installs the migrations" do
     expect(destination_root).to have_structure {
       directory "db" do
         directory "migrate" do
@@ -24,4 +24,17 @@
     }
   end
 
+  it "installs the javascript" do
+    expect(destination_root).to have_structure {
+      directory "vendor" do
+        directory "assets" do
+          directory "javascripts" do
+            file "announcements.js" do
+              contains "hideAnnouncement"
+            end
+          end
+        end
+      end
+    }
+  end
 end