add missing project files

In theory, no project files should be checked in since they are autogenerated
and contain hardcoded paths. But I'm checking them in for my own convenience.
Remove if someone else starts hacking on it.

To regenerate project files (on Mac):
cd /Users/Shared/UnrealEngine/4.1/Engine/Build/BatchFiles/Mac
./RocketGenerateProjectFiles.sh -project="/Users/<...>/ucupcake/Cupcake.uproject" -game