make course designer keep index and conf so that course can be rebuilt
initial add of rebuild course functionality
misc workflow and layout tweaks for rebuild course; also fix an issue where the auth.user object wasn't updated when a new course was created
automatically create the instructor group if it doesn't already exist (#234).
generate disqus id using the course name so that discussion blocks are specific to that course
copy jquery file to the correct filename
small typo in doctree folder name
Merge pull request #236 from isaacdontjelindell/rebuild-course-issue-226

Add ability to rebuild a course
Merge pull request #237 from isaacdontjelindell/instructor-issue-234

automatically create the instructor group if it doesn't already exist
Merge pull request #238 from isaacdontjelindell/disqus-issue-235

generate disqus id using the course name