Fix preview code to account for UTF-8 characters.
Fix preview code to account for UTF-8 characters.

- Fix home page and help page preview code to account for
  UTF-8 characters.

- Remove used for 'iconv' workaround for UTF-8 conversion.

- Conflicts:
    app/assets/javascripts/preview_help_page.js
    app/assets/javascripts/preview_home_page.js
    app/controllers/help_controller.rb

concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse