Export TextureObject constructor again for OpenCL's sake. Bump versio…

…n number to 2.9.1.0. Fixes haskell-opengl#45.

Simpler and more consistent transformFeedbackVaryings API.

hackage release 2.8.0.0

Hackage release v2.6.0.1

Hackage release 2.6.0.0

Create tag v2.5.0.0 for hackage

Tag hackage version v2.2.3.1

Second attempt at hackage release v2.2.3.1

Tag hackage release

Tag hackage release