Updated PieChart to correctly modify SliceObjects with finger touch and to re-calculate slice percentages.

Signed-off-by: Andalon <dg4christ08@gmail.com>
Merge branch 'master' of https://github.com/Andalon/SketchyGraph

Conflicts:
	SketchyGraph/bin/Debug/SketchyGraph.exe
	SketchyGraph/bin/Debug/SketchyGraph.pdb