updates for the move to the "redding" org and some other cleanups

This removes the auto activator tag and just uses the "rb" name.
I updated the README with new install/uninstall URLs and updated
usage/help messages.

This includes a minor fix to `rb -h` as well.
Merge pull request #20 from redding/kr-updates

updates for the move to the "redding" org and some other cleanups