Codesprint: Added leaderboard and how to earn points
Various markup fixes
Merge pull request #229 from pjackson28/addleaderboard

Codesprint: Added leaderboard and how to earn points
Fixed markup validation errors
Merge pull request #230 from pjackson28/morefixes

Fixed markup validation errors
Added the missing .gitmodules
Merge pull request #231 from LaurentGoderre/convert-to-submodule

Added the missing .gitmodules
adding a bunch of new sessions