Revert "Removed LDAP support as it was specific to one organization"

This reverts commit 7315262323b4b6ebb28be0ae9a0b1e3bf5932b46.
Merge branch 'refs/heads/master' into vtkleuven-master
Merge branch 'master' into vtkleuven-master
Merge branch 'master' into vtkleuven-master
Changed some text
Merge branch 'master' into vtkleuven-master
Merge branch 'master' into vtkleuven-master
Merge branch 'master' into studentit-master
Updated .gitignore
Small layout change
Merge branch 'master' into studentit-master
Merge branch 'master' into vtkleuven-master
Merge branch 'master' into studentit-master
Merge branch 'master' into vtkleuven-master
Merge branch 'master' into studentit-master
Merge branch 'master' into vtkleuven-master
Merge branch 'master' into studentit-master
Merge branch 'master' into vtkleuven-master
Merge branch 'master' into studentit-master
Merge branch 'master' into vtkleuven-master