If a user is anonymous when they click the enroll button, they will automatically be enrolled in the course if they immediately log in our create an account.

Registering now temporarily logs you in. A message is displayed on the dashboard, reminding you to activate your account. Logging in shows a reminder about activating.

Changed check_course from a decorator to a regular function that throws exceptions. Much easier to understand now.

Moved static template views to one folder. Removed the stub view functions from student and used static_template_views instead.

* Enable account creation
* Some code cleanups
* Fix access to nonexistent fields in the account creation view
* Formatting fixes

This reverts commit 05e1bcf4.

The basic form has been fleshed out. Things still to do:
1) Extend get_course interface to the rest of modulestore
2) Make courses actually load
3) Make org/course/maybe others metadata attributes for course_module (see xml_module), so
that they are loaded/saved on import/export to xml

 - issue is that content machine isn't whitelisted for email
 - this also provides secondary filtering for user registration