Add `force` and `recursive`, and `ashift` attributes

Allows `force` for create/destroy, `recursive` for destroy, and `ashift` for create.  The
`force` attribute defaults to `false`, so this is a potentially
breaking change from previous behaviour.
Add `name` to metadata.rb, required for ridley/berkshelf/et al
Add new disks to pool (striped) when `disks` changes
Merge branch 'add_option_attrs' into local