Added nuget lib directory to gitignore
Added release notes for OpenTK
Copy build artifact to root directory regardless of artifact name
Generate both build timestamp and version information
Do not commit build timestamp to repository
Improved nuget version information
Generate xml documentation for OpenTK.GLControl
Generate nuget package for OpenTK.GLControl
Updated description
MonoDevelop insists on making these changes
Add OpenTK.dll.config as content