Added shells for assignment 0
Updated AtomicLongTest.java to use the Command pattern to simplify the code.
Fixed the comment for decrementAndGet()
Added more links to tutorials on CountDownLatch
Added the ThreadedDownloads application, which is the focus of several videos in Section 1: Module 3: Android Concurrency frameworks
Some Improvements for the ThreadedDownloads example
-also, some git-related housekeeping, to keep student's repos as clean as possible.
Renamed the files to reflect the new naming convention.
Added the new assignment 0.5, which focuses on creating a SimpleSemaphore that implements "Fairness".
Converged all the assignments so they build on each other in a linear sequence.
Merge branch 'master' of https://github.com/mawalker/POSA-14 into mawalker-master

Conflicts:
	ex/ThreadedDownload/src/edu/vuum/mocca/ThreadedDownloads.java
Some light editing and reformatting.
Fixed a few bugs.