[#4671] remove old-style LastCommitDoc model and logic
[#4671] remove old-style LastCommitDoc model and logic

lym/allura-git,heiths/allura,heiths/allura,lym/allura-git,heiths/allura,lym/allura-git,apache/incubator-allura,apache/incubator-allura,apache/allura,apache/allura,lym/allura-git,apache/incubator-allura,apache/incubator-allura,heiths/allura,apache/allura,lym/allura-git,apache/allura,apache/allura,heiths/allura