e08542c fix doc
e95c962 remove I prefix from interface, serializable now takes in pointer
git-subtree-dir: subtree/rabit
git-subtree-split: e08542c6357bc044199e4876d9bea949d05f614c
1db6449 remove include in -I, make things easier to direct compile
git-subtree-dir: subtree/rabit
git-subtree-split: 1db6449b019902e99de446c84aa36e73c03eb888