Upgraded project and solution files to VS2013.
Refactored async methods to use tasks.
Modified sendProxyConnectRequest method
Modified setClientStream method
Fix a few for SetHttpProxy method
Modified some error messages
Renamed SetHttpProxy to SetProxy
Refactored Logger.cs
Refactored HttpListenerRequest.cs
Added GetValue (this string, string, bool) method
Refactored Ext.cs
Refactored Ext.cs
Refactored Cookie.cs
Refactored CookieCollection.cs
Modified Unquote method
Added GetEncoding method
Refactored HttpUtility.cs
Refactored HttpUtility.cs
Refactored Ext.cs
Refactored HttpListenerResponse.cs