Merge pull request #13 from dwenzel/dev

Dev
Merge pull request #14 from dwenzel/release/0.15

Release/0.15
version 0.15.0
class name of query settings corrected
Merge branch 'feature/refactorPerformanceRepository' of github.com:dwenzel/t3events into feature/refactorPerformanceRepository
base class changed to AbstractRepository
Merge branch 'feature/refactorPerformanceRepository' into dev