Merge error fixes
ReviewTest/GradeTest/DB Queries
conflict fix
conflict fix
Merge https://github.com/kerrermanisNL/PDL

Conflicts:
	PDL/src/main/java/connection/DB.java
	PDL/src/main/java/controllers/reviewTest.java
Merge pull request #40 from zanax/master

DB conflict Fixes en viewTest en gradeTest
administrator panel
merge met niels
merge
merge met Gijs
Terug(naar teacher panel) knoppen