debian: Require libblkid to build
debian: bcache is Linux-specific
debian: Standards-Version is 3.9.4
debian: Convert to DEP-5
debian: Update description, add homepage field
debian: Configure git buildpackage

Build with:

    git checkout master
    git checkout debian
    git buildpackage

Use `git buildpackage -us -uc` if you aren't the maintainer and
can't sign changes.