removed dependency on System.Web, inspired by @RickStrahl's blog post: http://weblog.west-wind.com/posts/2014/Sep/08/A-NET-QueryString-and-Form-Data-Parser

* replaced HttpUtility.UrlEncode and UrlDecode with Uri.EncodeDataString and UnencodeDataString
removing the redundant furlsharp qualifier
removing trailing whitespace, unused using statements, and fixing some resharper warnings; other resharper warnings left deliberately to demonstrate syntax