NoteLab 0.1.5 Released

NoteLab Version 0.1.5 Changelog
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Summary
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* Improvement: Greatly improved the performance of scrolling the canvas.
* Improvement: Improved the way strokes are rendered when they are selected.
* Improvement: Changed the toolbar icon size from 20 pixels by 20 pixels
to 16 pixels by 16 pixels.

* Bug fix: Fixed a bug in the rendering system. Now strokes are rendered
much smoother than in previous versions.
* Bug fix: Fixed a bug where strokes would not be resized correctly