Refactoring and Adding Tests (#28)

* Introducing repository and refactoring services.
Changing entities to use int keys everywhere.

* Refactoring application services to live in web project and only reference repositories, not EF contexts.

* Cleaning up implementations

* Moving logic out of CatalogController
Moving entity knowledge out of viewmodels.

* Implementing specification includes better for catalogservice

* Cleaning up and adding specification unit tests

src/ApplicationCore/Services/UriComposer.cs

@@ -7,10 +7,8 @@ namespace ApplicationCore.Services
     {
         private readonly CatalogSettings _catalogSettings;
 
-        public UriComposer(CatalogSettings catalogSettings)
-        {
-            _catalogSettings = catalogSettings;
-        }
+        public UriComposer(CatalogSettings catalogSettings) => _catalogSettings = catalogSettings;
+
         public string ComposePicUri(string uriTemplate)
         {
             return uriTemplate.Replace("http://catalogbaseurltobereplaced", _catalogSettings.CatalogBaseUrl);