Re-instate snk
Add solution configuration "Release-Signed"
Signe projects in Release-Signed build configuration
Remove unrequired build configs for test projects
Only sign assemblies in Release-Signed project config (required manual edit of csproj files)
Signed and unsigned nuspecs. Update build script to build Release-Signed.
Merge pull request #248 from damianh/SignedAssemblies

Signed assemblies