Adds Or-list
Adds Not-Filter
Adds FileInfoInterface
Merge pull request #13 from heiglandreas/feature/OrList

Adds Or-list
Merge pull request #10 from heiglandreas/feature/addMimeTypeFilter

Feature/add mime type filter
Merge pull request #12 from heiglandreas/feature/Not

Feature/not
Adds FIleSize-Filter
Refactoring