title: Can't use RestSharp Portable in PCL with both of Xamarin.IOS and Xamarin.Android frameworks
body: <p>Is there possible way to use portable versions of RestSharp in PCL shared between Xamarin.Android and Xamarin.Ios?? 
  I have next error when installing RestSharp.Portable library in project:</p>
  
  <p>Install-Package : Could not install package 'FubarCoder.RestSharp.Portable 1.5.0.1'. You are trying to install this package into a project that targets 'portable-win+net45+sl40+wp71+MonoAndroid16+MonoTouch40', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.</p>