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.