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.
Fixed some issues that were confusing students.
Enable offline "downloading" by default.
added a final.
More fixes.
Added the grading driver
Added the new GeoNamesApplication example that demonstrates the use of BoundServices.
Added project.properties.
Removed .gitignore.
Renamed project to differ.
Fixed this to add -grading.
Added project.properties.