Get rid of bad epsilon that was one cause of #17

Code/facepunch.libpolygon/PolygonMeshBuilder.Bevel.cs

@@ -516,7 +516,7 @@ private static float CalculateSplitDistance( in Edge edge, in Edge other, in Edg
 
 		var t = dx / dv;
 
-		if ( t <= -0.0001f )
+		if ( t < 0f )
 		{
 			return float.PositiveInfinity;
 		}