centralized all working directories at .work in the root of the tree. also centralize all download directories to .download at the root of the tree.
cleaned up the rsync behavior between host and docker cross build when running on non-linux host.
we now publish build artifacts to an S3 bucket, by default
its release.rook.io. We no longer push bits to github on
make publish.
Added support for AWS cli in the cross-build container.
this add support for building rook with kraken and luminous
release of ceph. A new Makefile flag CEPH_BRANCH is used to
specify the version to be built.
Bassam Tabbara
Jared Watts