Remove unused enumerations tagDVASPECT and tagTYMED
Generate documentation file in debug builds
Use VSSDK dependencies from NuGet
Updated nuspec files to declare dependencies
Define DEV10PLUS and DEV11PLUS
Add build for extensions only targeting Visual Studio 2013 and newer
Merge pull request #14 from sharwell/build-cleanup

Build cleanup
Merge pull request #15 from sharwell/nuget-deps

NuGet dependencies