bcache: Explain how to use `--join`
Relax LVM identifiers

Followup to 181b5dfa4a175a52d9c08843d0ed769b1c910726
Should address #4.
Update the README
Bump version number for ppa upload
Merge branch 'master' into debian

* master:
  Bump version number for ppa upload
  Update the README
  Relax LVM identifiers
  bcache: Explain how to use `--join`
debian: New upload