Removing limitation on where the turn knob can be started.

Limiting the angle in angleBetweenCenterAndPoint: disallows grabbing the
knob in angle < minimumAngle and angle > maximumAngle.  Since
setValue:animated: checks the value limits we can simply remove checking
the angle limits in angleBetweenCenterAndPoint:.

Classes/MHRotaryKnob.m

@@ -36,11 +36,6 @@ - (float)angleBetweenCenterAndPoint:(CGPoint)point
 	// coordinate system is turned upside down and rotated 90 degrees. :-)
 	float theAngle = atan2(point.x - center.x, center.y - point.y) * 180.0f/M_PI;
 
-	if (theAngle < minimumAngle)
-		theAngle = minimumAngle;
-	else if (theAngle > maximumAngle)
-		theAngle = maximumAngle;
-
 	return theAngle;
 }