Factored ManagerResource out as interface in order to be able to use client from VIPSBatch

src/main/java/no/bioforsk/vips/core/VIPSCoreApplication.java

@@ -37,6 +37,5 @@ public class VIPSCoreApplication extends Application
      */
     private void addRestResourceClasses(Set<Class<?>> resources) {
         resources.add(no.bioforsk.vips.core.config.JacksonConfig.class);
-        resources.add(no.bioforsk.vips.core.service.ModelResource.class);
     }
 }
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