Homepage|Build Repository: Source code packages now available in the repository

Doomsday Source code packages produced by the auto builder are now
made available from the build repository.

As usual, the latest source code packages also can queried for with
a "latestbuild?platform=source" query and JSON object graph info is
also available.
Merge branch 'master' of github.com:skyjake/Doomsday-Engine