Expose user defined proxy (#196)

* Expose Proxy to user
* Added missing dependency.

Author: troky

source/projects/MyCouch/ConnectionInfo.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Net;
 using EnsureThat;
 using MyCouch.Net;
 
@@ -32,6 +33,7 @@ public abstract class ConnectionInfo
         public bool AllowAutoRedirect { get; set; } = false;
         public bool ExpectContinue { get; set; } = false;
         public bool UseProxy { get; set; } = true;
+        public IWebProxy Proxy { get; set; } = null;
 
         protected ConnectionInfo(Uri address)
         {
@@ -59,4 +61,4 @@ private string[] ExtractUserInfoPartsFrom(Uri address)
                 .ToArray();
         }
     }
-}
+}

source/projects/MyCouch/Net/Connection.cs

@@ -62,6 +62,7 @@ protected virtual HttpClient CreateHttpClient(ConnectionInfo connectionInfo)
                 AllowAutoRedirect = connectionInfo.AllowAutoRedirect,
                 UseProxy = connectionInfo.UseProxy
             };
+            handler.Proxy = connectionInfo.Proxy;
 
             var client = new HttpClient(handler, true)
             {