Add hero banner to styleguide
Improved parallax
Code review
Merge pull request #696 from lonelyplanet/jesus/improve_parallax

Improved performance of parallax and add hero banner to styleguide
Added optional link in hero banners
Merge pull request #700 from lonelyplanet/jesus/interest_featured

Added optional link in hero banners
Added documentation for the debounce JavaScript helper function.
- Also reorganized the js-component names alphabetically