Section chapter notes update

This change is for https://www.pivotaltracker.com/story/show/48061551.

This updates chapter & section notes to ones found in May 2013 CD (htm files). This is an automatic parse, and as far as I can tell there are no major differences from our current version besides indentation which makes all the noise.

I also added parser script that was used for extraction.

This does not include commodity footnote update mentioned in the story.

After deploy need to run:

```shell
bundle exec rake tariff:install:taric:section_notes
bundle exec rake tariff:install:taric:chapter_notes
```

Which will overwrite and update current notes.