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Merge pull request #19 from cgcostume/buildsystem

Buildsystem
fix unix project config: provide cmake GLOW_HOME in find script
fix cmake for unix build
fix cmake
add TransformFeedback
Merge branch 'master' into transform_feedback_20
fix compilation of transform feedback (ref 20)
fix compilation of transform feedback (ref #20)
Merge branch 'transform_feedback_20' of github.com:cgcostume/glow into transform_feedback_20
move template specializations to cpp
add bool uniform specialization
Merge branch 'master' into transform_feedback_20

Conflicts:
	CMakeLists.txt
remove autobind in TransformFeedback when using begin/pause/resume/end
Made Transform Feedback destructor virtual (ref #20)
Add reading access for FBO attachments, add ::fromSource to Shader
Merge branch 'master' into transform_feedback_20
add documentation for TransformFeedback (ref #20)