Updating Newtonsoft.Json to 6.0.6

We use Json.NET to parse `project.json` for ASP.NET 5 projects. They use Json.NET 6 and the main issue is that they include single-line comments in the json files which is not supported in 5.x
I can't seem to get it to build successfully without these redirects. I don't know much about msbuild target files, but both the build target and the xunit target are throwing a conflict error with Newtonsoft 4.5.0.0 and all the unit tests fail to run. I am not sure why it's even attempting to load 4.5.0.0