Merge pull request #84 from mitchellgordon95/master

Updated line numbers to reflect pre-release fixes
Added import for import android.view.WindowManager;
Moved DownloadHandler definition a bit.
More DownloadHandler improvements.
Fixed dependencies.
Fixed the lock screen problem.
Zapped a "hint" that was OBE.
Added more documentation for Executor thread pools.
Added new ACronymApplication.
Added new assignment.
Fixed AndroidManifest.xml bug.
Fixed the appname.
Some fixes reported by students.
fixed androidmanifest.xml header.
Typo.
fixed threadpooldownloadservice.
Made the Service run in its own process.
Refactoring.
More tweaks.
Fixed ThreadPoolDownloadService.