Fixes for Grading.
Added AsyncTask.
Finished the JSON ResponseHandler integration.
Minor commenting fixes.
More updates and refactoring.
Refactored the code to only have a single ReplyMessenger in the Activity.
Added support for BinarySemaphore to illustrate how to use Java built-in monitor objects.
Fixed version info.
fixed version info.
Merge remote-tracking branch 'upstream/master'