Refining project definitions to capture published projects
at one place.
Sharing version of libraries cross all subprojects.
H2O Banner for h2o-dev.
Hadoop dependencies.
Exposing IO collection API.
Tiny log functions marking ignored exceptions.

Useful for retry-logic inside HDFS/S3 persist API.
Do not forget to backport authorization chain for S3.
Initial bare HDFS support.