Fix swapped template values in build_standalone_runner.rb.

`example_source_tags` and `example_spec_tags` each returned what the other
should have returned. I noticed this bug because it made the comments in
SpecRunner.html about where to include spec and source files incongruous with
the example tags that followed.

tasks/jasmine_dev/build_standalone_runner.rb

@@ -49,11 +49,11 @@ def example_jasmine_tags
     end
 
     def example_source_tags
-      script_tags_for ['spec/SpecHelper.js', 'spec/PlayerSpec.js']
+      script_tags_for ['src/Player.js', 'src/Song.js']
     end
 
     def example_spec_tags
-      script_tags_for ['src/Player.js', 'src/Song.js']
+      script_tags_for ['spec/SpecHelper.js', 'spec/PlayerSpec.js']
     end
   end
-end
+end