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Initial pull request was #328 ("Add a zoomslider control"), which was superseeded by #345 ("Add a zoomslider control"). #345 was merged into master and provided the first version of this control.
Exponential scaling got added in #473 (a different approach that lead to the beforementioned PR was in #396).
Currently there is one open issue regarding incorrect behaviour on touch-devices: #380 that possibly can be tracked down to an issue in Google closure: http://code.google.com/p/closure-library/issues/detail?id=309&q=dragger.
It might be best to not depend on goog.fx.Dragger but handle the dragging of the thumb inside ol-code only.