Converted project to portable class library
Removed all references and packages

Making a portable class library implies using compatible packages and
therefore references need a fresh start
Reconfigured references and packages

Additional Json.NET reference has been added to replace Microsoft JS
serializer (not available for PCL)
Updated uri scheme comparison to check against string constants

PCL does not provide uri scheme constants and therefore needed to be
replaced by hard coded strings
Updated json serialization to use Json.NET methods

Javascript serialization classes are not available in the PCL and
therefore needed to be replaced by Json.NET static classes
Cleaned up usings
Merge pull request #6 from Ucodia/portable-class

Portable Class Library for .NET4.0 / WP8 / Win8