downgraded the demo WebAPI project file to .Net 4.0 and VS2010 format

- removed the unncessary dependency on System.Web.Optimization

- updated the swagger ui to use the current server host/port rather than
  hard coding localhost on a specific port
adding a Pet controller for defect repro cases
updating swagger ui code to v1.1.15
restoring repro for nullable primitives on PetController