revert change of folder structure, introducing new interface folder

gemeinsamforschen/example-app/src/main/java/unipotsdam/gf/munchkin/controller/MunchkinImpl.java → gemeinsamforschen/src/main/java/unipotsdam/gf/munchkin/controller/MunchkinImpl.java

 package unipotsdam.gf.munchkin.controller;
 
-import unipotsdam.gf.munchkin.IMunschkin;
+import unipotsdam.gf.munchkin.interfaces.IMunschkin;
 import unipotsdam.gf.munchkin.model.Munschkin;
 
 import java.sql.*;

gemeinsamforschen/example-app/src/main/java/unipotsdam/gf/munchkin/IMunschkin.java → gemeinsamforschen/src/main/java/unipotsdam/gf/munchkin/interfaces/IMunschkin.java

-package unipotsdam.gf.munchkin;
+package unipotsdam.gf.munchkin.interfaces;
 
 import unipotsdam.gf.munchkin.model.Munschkin;
 

gemeinsamforschen/example-app/src/main/java/unipotsdam/gf/munchkin/service/RestyMunschkin.java → gemeinsamforschen/src/main/java/unipotsdam/gf/munchkin/service/RestyMunschkin.java

@@ -4,7 +4,7 @@ package unipotsdam.gf.munchkin.service;
  * Created by dehne on 24.04.2018.
  */
 
-import unipotsdam.gf.munchkin.IMunschkin;
+import unipotsdam.gf.munchkin.interfaces.IMunschkin;
 import unipotsdam.gf.munchkin.controller.MunchkinImpl;
 import unipotsdam.gf.munchkin.model.Munschkin;
 import javax.ws.rs.GET;

gemeinsamforschen/example-app/src/test/java/MunschkinLoaderTest.java → gemeinsamforschen/src/test/java/MunschkinLoaderTest.java

-import unipotsdam.gf.munchkin.IMunschkin;
+import unipotsdam.gf.munchkin.interfaces.IMunschkin;
 import unipotsdam.gf.munchkin.controller.MunchkinImpl;
 import unipotsdam.gf.munchkin.model.Munschkin;
 import org.junit.Test;