Merge pull request #87 from swisener/master

Respect Rails.public_path when computing the path to the manifest file.

Conflicts:
	lib/sprockets/railtie.rb
	test/test_railtie.rb

Author: Rafael Mendonça França

lib/sprockets/railtie.rb

@@ -65,7 +65,7 @@ def configure(&block)
     config.after_initialize do |app|
       config = app.config
 
-      manifest_path = config.assets.manifest || File.join(app.root, 'public', config.assets.prefix)
+      manifest_path = config.assets.manifest || File.join(config.paths['public'].first, config.assets.prefix)
 
       # Configuration options that should invalidate
       # the Sprockets cache when changed.

test/test_railtie.rb

@@ -185,4 +185,13 @@ def test_manifest_path
 
     assert_match %r{config/foo/manifest-.*.json}, ActionView::Base.assets_manifest.path
   end
+
+  def test_manifest_path_respects_rails_public_path
+    app.configure do
+      config.paths['public'] = 'test_public'
+    end
+    app.initialize!
+
+    assert_match %r{test_public/assets/manifest-.*.json}, ActionView::Base.assets_manifest.path
+  end
 end