Upgrading the projects to .NET 4.5
Updating all the package references
Upgrading to Json.Net 4.5.11
Fixing the following issues which prevent the projects from building in 4.5:
* MachineKey.Encode/Decode are deprecated in 4.5
* ParameterInfo.GetCustomAttributes<T> was added in 4.5 causing ambiguity
* UnvalidatedRequestValues was added in 4.5 causing ambiguity