HumBuch/HumBuch — pull request #540 by B3nRa (2014-01-29 11:59:15+00:00)
Title: Implemented fullImport in StudentInformationViewModel.

All students that do not have any materials borrowed are deleted from db
and the students of the csv are inserted.
If it is a delta import, just the new students are inserted or existing
ones are updated. No student is deleted.

resolves #535