Updated Ninject Prism Extension for Ninject 3 / Prism 4.1

Hi Edys,

I forked your package and updated the nuget-references to the current Ninject 3 and Prism 4.1 packages. This became necessary because your current Nuget package only works with Ninject 2 and Prism 4.

Hope that you can pull the changes to your repository and offer a nuget package that can be used by the public.

Thanks in advance
- Gerhard