Incorporated various suggestions for improvement.
- Used centralized handling of platform type, avoiding duplications of
"The Android Project" magic String

- Removed PlatformStrategyFactory, as it anyway was not used
consistently, and as the strategy depends on the input types.
Merge pull request #49 from jeisfeld/master

Cleanup of platform handling
Merged improvements to the skeletons.
Added week-6-assignment-5 skeletons.
Force adding project.properties.
Removed project.properties that was in the wrong place.
Added back a {}.
Fixed documentation.
Merge branch 'master' of https://github.com/douglascraigschmidt/POSA-14
Fixed some issues that were confusing students.
Enable offline "downloading" by default.
added a final.
Merge branch 'master' of https://github.com/douglascraigschmidt/POSA-14
week-5-assignment-4