Updated Data and Downloads classes to use static types instead of JS objects. Added new type definitions.
Merge branch 'master' of https://github.com/Khan/khan-windows-8
Added icon and updated bg color for Projects and Discovery Lab. Also updated the data set which ships with app. #31
Merge pull request #34 from anprak/master

Fix for #31 and refactoring to use explicit types for data and download classes.