desubmodulize.md

1. one has to get a new fork from dmlc/xgboost like this one

2. because of the use of submodules, devtools doesn't work anymore with installing the R-packages. One has to remove the submodules in the following manner:

• http://stackoverflow.com/questions/1030169/easy-way-pull-latest-of-all-submodules
• https://gist.github.com/kyleturner/1563153

3. bring back the necessary customizations that we've made here

4. test the new repo with avant-analytics and run("demo_xgb_R")

5. delete the old copy of xgboost under avantcredit github group and transfer the new fork's ownership to avantcredit

6. update lockfile.yml to point to the new R-package