Update .net framework version to v3.5
Update .net framework version to v3.5

to at least be able to install a mock library through nuget.
With .net 2.0, problem is that....
* If you try to add a package through the nuget manager,
 you have no error but no packages are found and you don't know why :(
* If you do it within the Package Manager Console, the error is not very straight forward.

I think we should update the targeted version.
That should not be a big deal now that there is a free community version
 of Visual Studio....

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