Added ConfigurationBuilder to Empty Project template. Closes OmniSharp#685

Author: sesispla

templates/projects/emptyweb/Program.cs

@@ -4,14 +4,21 @@
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
 
 namespace <%= namespace %>
 {
     public class Program
     {
         public static void Main(string[] args)
         {
+           var config = new ConfigurationBuilder()
+                .AddCommandLine(args)
+                .AddEnvironmentVariables(prefix: "ASPNETCORE_")
+                .Build();
+            
             var host = new WebHostBuilder()
+                .UseConfiguration(config)
                 .UseKestrel()
                 .UseContentRoot(Directory.GetCurrentDirectory())
                 .UseIISIntegration()

templates/projects/emptyweb/project.json

@@ -5,7 +5,11 @@
       "type": "platform"
     },
     "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-rc2-final",
-    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-final"
+    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-final",
+    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc2-final",
+    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0-rc2-final",
+    "Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final",    
+    "Microsoft.Extensions.Configuration.CommandLine": "1.0.0-rc2-final"
   },
 
   "tools": {