Set major to version 6.0
Any projects that were .net 4.0 are now .net 4.5
Reinstall net40 packages so projects reference the net45 bits.
Update bunch of nuget package references Fixes #363
Using psake nuget package
Use xunit runners and ilmerge packages instead of bin dir. Fix IlMerge build step to target correct platform.
Remove build artifacts that were accidently added to the repository.