Fix bug STUD-103. The url base for about page links needs to be www.edx.org for Drupal site, vs. LMS_BASE which is used for Studio. Note that the complete URL is still not correct, but a redirect exists to take it to the new location.
pep8 cleanup.
studio - replaces iconography for advanced component button within the unit view
Merge pull request #55 from edx/fix/btalbot/studio-advancedicon

Studio - Advanced Component Icon
Merge pull request #51 from edx/bug/christina/about_page_url

Fix bug STUD-103. The url base for about page links needs to be www.edx....
Merge branch 'master' into jonahstanley/add-navigation-tests
Refactored Navigation Methods