be more forgiving about the iframe url

If anything after mktg/ does not parse as a course-id return "coming soon"
This will prevent 404 errors when urls are incorrect on the marketing
site.

Make register button for marketing site break out of iframe

Better error handling for when marketing urls are missing

Redirect from LMS courses page to marketing courses page

(Only if marketing site is enabled)

Use window.top.location.href instead of location.href for redirection.

edx.org - resolved iframe button styles in IE + added in coming soon state

edx.org - resolved (in a dirty way) iframed buttons picking up style in IE and added in coming soon style treatment

Fix links between marketing site and courseware.

* Fix indentation/line break issues
* Handle marketing root URL as a separate case in marketing_link
* Move link map to its own setting.

Update course registration flow for non-modal registration and login

Jarv/drupal new/iframe

Pep8 fixes

and use it for the new marketing site links.

access login_required page.

If an unauthenticated user clicks on a course registration button, they will
be redirected to the user registration page. Now, that page will include a link
to the login page. If the user follows the link and logs in successfully, then
they will be enrolled in the class.

Now that we are using separate pages for login and registration rather than
modals, clicking the registration button for a course should direct an
unauthenticated user to the registration page, and the user should be enrolled
in the course upon successful registration. Likewise, an unauthenticated user
attempting to unenroll from a course should be directed to the login page and
subsequently unenrolled from the course upon successful login. The enrollment
change service also now uses HTTP status codes rather than JSON to communicate
status to the front end.

Update links in footer to point to the right pages.
Update link on dashboard without any classes.
Update links in header.
Update links on sign in and register pages.

Drupal: Add cookie name to the cms settings so we don't error out while looking for it

while looking for it