Merge pull request sharpdx#898 from jclin/structs

DirectWrite enhancements

Bump version to 3.1.1

Update release notes

[Build] Add tag to 3.0.2

[Build] Fix nuget for SharpDX.Animation

[Build] Don't let the build push the nuget packages

[Build] Exit with error if nuget failed

[Build] Update release notes

[Build] Fix issue with nuget package for universal apps

[VisualStudio] Update VisualStudio extension to support SharpDX 2.6.0…

… nuget packages