Merge pull request #12 from rootfs/wip-javadoc

fix javadoc
bump up version to 0.80.4

Signed-off-by: rootfs <hchen@redhat.com>
Merge pull request #13 from rootfs/wip-version

bump up version to 0.80.4
initialize CephFS and conditionally umount

Signed-off-by: rootfs <hchen@redhat.com>