Added week-5-assignment-4 grading driver.
Fixed typo.
Added Assessment-Description.txt
Fixed typos.
fixed comment
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.