Fix startup when you reference the assembly directly instead of Hosting

- I missed this change in Program.cs when doing the initial package merging

samples/SampleApp/project.json

@@ -13,6 +13,7 @@
     },
     "commands": {
         "run": "Microsoft.AspNet.Server.Kestrel",
+        "kestrel": "Microsoft.AspNet.Server.Kestrel",
         "web": "Microsoft.AspNet.Hosting"
     }
 }

src/Microsoft.AspNet.Server.Kestrel/Program.cs

@@ -18,7 +18,7 @@ namespace Microsoft.AspNet.Server.Kestrel
         public void Main(string[] args)
         {
             var program = new Microsoft.AspNet.Hosting.Program(_serviceProvider);
-            var mergedArgs = new[] { "--server", "Kestrel" }.Concat(args).ToArray();
+            var mergedArgs = new[] { "--server", "Microsoft.AspNet.Server.Kestrel" }.Concat(args).ToArray();
             program.Main(mergedArgs);
         }
     }