Fixed welcome.
Merge branch 'backup'
Made a list of courses and indexes.
A better welcome page that shows al presentations per course.
Comment old unused code
Removed column if not loggged in.
Changed text of presentations index.
Merge + fix add issues
Merge branch 'master' of github.com:sillevl/presentr
Merge + Added new presentation button to _listCoursesAndPrsentations.