Minor specification updates (#93)

src/ApplicationCore/Specifications/BaseSpecification.cs

@@ -7,7 +7,7 @@ namespace ApplicationCore.Specifications
 {
     public abstract class BaseSpecification<T> : ISpecification<T>
     {
-        public BaseSpecification(Expression<Func<T, bool>> criteria)
+        protected BaseSpecification(Expression<Func<T, bool>> criteria)
         {
             Criteria = criteria;
         }