Fix problem with floating point comparison (report and patch by jparish9001)

git-svn-id: https://flot.googlecode.com/svn/trunk@286 1e0a6537-2640-0410-bfb7-f154510ff394

jquery.flot.pie.js

@@ -403,7 +403,7 @@ More detail and specific examples can be found in the included HTML file.
 					}
 						
 					ctx.beginPath();
-					if (angle!=Math.PI*2)
+					if (Math.abs(angle - Math.PI*2) > 0.000000001)
 						ctx.moveTo(0,0); // Center of the pie
 					else if ($.browser.msie)
 						angle -= 0.0001;
@@ -688,7 +688,7 @@ More detail and specific examples can be found in the included HTML file.
 				octx.fillStyle = "rgba(255, 255, 255, "+options.series.pie.highlight.opacity+")"; // this is temporary until we have access to parseColor
 				
 				octx.beginPath();
-				if (series.angle!=Math.PI*2)
+				if (Math.abs(series.angle - Math.PI*2) > 0.000000001)
 					octx.moveTo(0,0); // Center of the pie
 				octx.arc(0,0,radius,series.startAngle,series.startAngle+series.angle,false);
 				octx.closePath();