added PCL project and shim for ConcurrentDictionary
added packages for portable project
use the correct output paths
use the packages.config like a good boy
point tests and Octokit.Reactive to PCL project
the flow on effects from using Microsoft.Bcl.Async and Microoft.Net.Http are giving me feels
hack because we don't have serialization any more for the PCL projects
make Octokit.Reactive a PCL project too