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

src/Infrastructure/Data/EfRepository.cs

@@ -1,11 +1,11 @@
-using ApplicationCore.Interfaces;
+using Microsoft.eShopWeb.ApplicationCore.Interfaces;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.eShopWeb.ApplicationCore.Entities;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 
-namespace Infrastructure.Data
+namespace Microsoft.eShopWeb.Infrastructure.Data
 {
     /// <summary>
     /// "There's some repetition here - couldn't we have some the sync methods call the async?"