Fixed Issue #21: TrackableEntities.tt From EDMX and Complex Type.

Updated EDMX client T4 template in WebApiSample.ModelFirst to derive complex types from ModelBase; added client code to manually mark complex type as Modified and update parent entity.

Updated CSharpDbContext.Types.tt to support complex types; added T4 template to VS2012 and VS2013 Deploy projects. Also incremented Deploy projects to v 2.5 and added release notes file.
Issue #22: Updated NuGet packages in all the sample apps.
Issue #22: Updated NuGet package versions in project templates - packages.config, .csproj, .vstemplate files. Replaced project template zip files.
Issue #22: Updated VS2012 Deploy project, templates and WebApi sample.
Issue #22: Updated VS2013 Deploy project with NuGet packages and project templates.
Issue #22: Added VS Shell and ComponenModelHost DLL's to lib folder for Extensions\Common\Wizards.
Issue #22: Moved common wizard NuGet packages and added to the repository.
Added Packages/Microsoft.AspNet.WebApi.Core.5.2.2.nupkg.
Issue #22: Created a VS2015 Deploy project which includes all the VS2013 templates.
Issue #22: Regenerated 2.2.0 VSIX files for VS2012, VS2013 and VS2015.