Added public lists
Removed linkifier table
Modified tests to conform to new lists
Added identifier for public lists in index page
Eliminated repeated listings for public lists; made remove link in index actually leave the list instead of attempting to destroy it
Merge pull request #225 from Dantemss/practice_widget_api

Public lists
Don't require login on API pages, send Access-Control-Allow-Origin headers, use question params instead of ID to be more consistent with the rest of the site
Minor comment change
Updated tests to reflect changes in controllers
Merge pull request #227 from Dantemss/practice_cross_site

Practice cross site
updated mathjax cdn for embed page