Added NuGet spec files, updated AssemblyInfo.cs files to include updated
metadata.
Updated VS2012 project file.
Update spec file to include TinCanAPILibrary.
Added strong name signing to TCAPI and TinCan packages.
Added strong names to assemblies and forced Newtonsoft lib version to
4.0.5.0.
Merge pull request #13 from zachlowry/nuget-support

Added NuGet spec files, updated AssemblyInfo.cs files to include updated metadada.