Added lessons, finished courses

However, the schedule queries don't have full URL's, should be fixed.
Schedule: URL fix, pagination, date as parameter
Added date parameters to Course schedule
Show id's
Removed unnecessary method
Fixed missing id's, and correct begin/end date
Minor date fix
Merge pull request #1 from ZolnaiDani/master

Added lessons, finished courses
Merge pull request #3 from ijansch/master

Roosters en enkele wijzigingen