Moved other hooks out of the processOptions hook.

In plugins we should never add hooks conditionally; the condition should
remain within individual hooks, so the plugin can be toggled at any
time.

Ideally we should also 'inline' the hook functions, since they're used
nowhere else.  But since that would involve a lot of code changes, we'll
put it off until the broader cleanup effort scheduled for 0.9.0.

jquery.flot.pie.js

@@ -113,20 +113,9 @@ More detail and specific examples can be found in the included HTML file.
 				} else if (options.series.pie.tilt < 0) {
 					options.series.pie.tilt = 0;
 				}
-
-				// add processData hook to do transformations on the data
-
-				plot.hooks.processDatapoints.push(processDatapoints);
-				plot.hooks.drawOverlay.push(drawOverlay);
-
-				//  draw hook
-
-				plot.hooks.draw.push(draw);
 			}
 		});
 
-		// bind hoverable events
-
 		plot.hooks.bindEvents.push(function(plot, eventHolder) {
 			var options = plot.getOptions();
 			if (options.series.pie.show) {
@@ -139,6 +128,27 @@ More detail and specific examples can be found in the included HTML file.
 			}
 		});
 
+		plot.hooks.processDatapoints.push(function(plot, series, data, datapoints) {
+			var options = plot.getOptions();
+			if (options.series.pie.show) {
+				processDatapoints(plot, series, data, datapoints);
+			}
+		});
+
+		plot.hooks.drawOverlay.push(function(plot, octx) {
+			var options = plot.getOptions();
+			if (options.series.pie.show) {
+				drawOverlay(plot, octx);
+			}
+		});
+
+		plot.hooks.draw.push(function(plot, newCtx) {
+			var options = plot.getOptions();
+			if (options.series.pie.show) {
+				draw(plot, newCtx);
+			}
+		});
+
 		// debugging function that prints out an object
 
 		function alertObject(obj) {