Add database commits

GerbilManagerWebAPI/Controllers/GerbilsController.cs

@@ -64,6 +64,7 @@ namespace GerbilManagerWebAPI.Controllers
             }
             
             this.unitOfWork.GerbilRepository.Insert(gerbil);
+            this.unitOfWork.Save();
 
             return CreatedAtAction(nameof(GetGerbil), new { id = gerbil.Id}, gerbil.AsDto());
         }
@@ -85,6 +86,8 @@ namespace GerbilManagerWebAPI.Controllers
             };
 
             unitOfWork.GerbilRepository.Update(updatedGerbil);
+            this.unitOfWork.Save();
+
             return NoContent();
         }
 
@@ -99,6 +102,7 @@ namespace GerbilManagerWebAPI.Controllers
             }
 
             unitOfWork.GerbilRepository.Delete(existingGerbil);
+            this.unitOfWork.Save();
 
             return NoContent();
         }