Added more information about sponsors.

Change-Id: I508251eb424b7400bf4be6047b87180e64e66275
Allow using html in comments.

Change-Id: I954c3e67284380667fc6b9da0f05e910aa3de9a0
Finish implementing prize giveaway registration.

Change-Id: I3d92f9cc02a6c05289e734664c9a6d01e5ad6b93