mark method added, so the garbage collector is triggered
glfw target fix so it doesnt crash when the button-array contains less than 3 entries
Merge pull request #26 from JochenHeizmann/master

Missing mark method
properly clone Scale, Color, Size and Position in Sprite.Clone()
add MatrixHelper.RoundScale
Merge branch 'master' into timeline-animation

* master:
  add MatrixHelper.RoundScale
  properly clone Scale, Color, Size and Position in Sprite.Clone()
  glfw target fix so it doesnt crash when the button-array contains less than 3 entries
  mark method added, so the garbage collector is triggered