another bugfix.
BorrowedMaterials werden auch dann als zurückzugeben markiert, wenn sie
ihr Rückgabedatum im letzten Schuljahr liegt
Merge pull request #677 from davvitt/fixedReturnViewModel

another bugfix.
run db scripts after deployment
Merge pull request #679 from davherrmann/issue#639

run db scripts after deployment
fixed deployment db fill script
Merge pull request #681 from davherrmann/issue#639

fixed deployment db fill script
added helper methods for creating schoolyears
added JUnit test for LendingViewModel
Merge pull request #687 from davherrmann/issue#215

Issue#215
Fixed warning window of settings tab
Merge pull request #689 from jidel/issue#686

Fixed warning window of settings tab
Added "testFullImport" and "testDeltaImport".
It tests if full import and delta import store the entities correctly.
Added "updateStudentByImport" test method. 
Tests if a student is replaced correctly with an imported student having
the same id.
Merge pull request #691 from B3nRa/#649

#649: add JUnit tests for StudentInformationViewModel
Deleted PDFOrderList.
It is not needed in our program. (Was used by previous group)
Merge pull request #693 from B3nRa/#652

Deleted PDFOrderList.