Add database commits

GerbilManagerWebAPI/Controllers/LittersController.cs

@@ -62,6 +62,7 @@ namespace GerbilManagerWebAPI.Controllers
             };
 
             this.unitOfWork.LitterRepository.Insert(litter);
+            this.unitOfWork.Save();
 
             return CreatedAtAction(nameof(GetLitter), new { id = litter.Id}, litter.AsDto());
         }
@@ -84,6 +85,8 @@ namespace GerbilManagerWebAPI.Controllers
             };
 
             unitOfWork.LitterRepository.Update(updatedLitter);
+            this.unitOfWork.Save();
+            
             return NoContent();
         }
 
@@ -98,6 +101,7 @@ namespace GerbilManagerWebAPI.Controllers
             }
 
             unitOfWork.LitterRepository.Delete(existingLitter);
+            this.unitOfWork.Save();
 
             return NoContent();
         }