Change log: (Feb. 8th, 2013)
=========================

- Added feedback summary option (e.g., avg. time, % correct)
	Enabled by adding feedback="true" to a TestPart, default is false.
	Feedback is presented in an AS3 Alert box.

- Added "onset delay" attribute.
	This allows more flexibility in the Item components to create 
	custom timed sequences of events, for example by using AS3 timers 
	in the .mxml document, while maintaining correct RT feedback.
	
	Enabled by first adding a bindable variable called onsetDelay to the 
	mxml document. For example, a 2000ms onset delay:
	
		[Bindable]
		public var onsetDelay:uint = 2000;
	
	Then adding an onsetDelay attribute to the TestPart mxml object as
	follows: onsetDelay="{onsetDelay}". 
	
	If a Feedback object is used in	the TestPart object that displays 
	responseTime, then this attribute must also be added to the 
	Feedback object.
	
- Added capture of "too early" responses
	With an onset delay people may respond before the target appears.
	This will capture those responses. In the .csv file they receive a
	value of "-99" to distinguish them from correct and incorrect.
	
- New feedback type for early responses: <early></early>
	This allows for immediate "too early!" feedback on a trial basis.