Standardize namespaces to all be under the Microsoft.eShopOnWeb namespace and update default namespaces. (#102)

src/ApplicationCore/Specifications/BaseSpecification.cs

@@ -1,9 +1,9 @@
-using ApplicationCore.Interfaces;
+using Microsoft.eShopWeb.ApplicationCore.Interfaces;
 using System;
 using System.Linq.Expressions;
 using System.Collections.Generic;
 
-namespace ApplicationCore.Specifications
+namespace Microsoft.eShopWeb.ApplicationCore.Specifications
 {
     public abstract class BaseSpecification<T> : ISpecification<T>
     {