Update README.md with description of per-project config
Update README.md with description of per-project config

umbrant/dist_test,xiao-chen/dist_test,umbrant/dist_test,umbrant/dist_test,cloudera/dist_test,xiao-chen/dist_test,umbrant/dist_test,cloudera/dist_test,cloudera/dist_test,cloudera/dist_test,xiao-chen/dist_test,xiao-chen/dist_test