Merge pull request #17 from mawalker/master

Convert Tests for Week-3-Assignment-2 to JUnit
Added JUnit tests for week-3-assignment-2.
Added the POSA MOOC FAQ here.
Removed the FAQ since it doesn't belong here.
Updated the documentation.
Fixed typo.
Added the SimpleAtomicLong.java file back to the grading driver.
Added a hint about the type of variable used for availablePermits.
Moved the data members to the beginning of the SimpleSemaphore class to be consistent with the other classes in other assignments.
The assignment is now ready for release!
Added the grading-driver.
Changed project name.
Fixed a mistake.
Fixed typo.
Changed 12 to 24 to reflect the proper number of unit tests.
Improved discussion of ConditionObject vs. Condition.
Added the first cut of the DownloadApplication.
Added final.
Some fixes.
Fixed misuse of SimpleAtomicLong.