Add roles to glossary.
Mention YAML variable quoting.
Use get_bin_path for blkid and add some aliases to the filesystem module.
re-add docs css class required for some theme elements
Small fix so template plugins can see inject variables.
Merge pull request #3168 from tgerla/doccontent

re-add docs css class required for some theme elements
Update packaging dates in preparation for release.
Version bump and assorted things to start new development version.
Update .gitignore
Update docs to reference release tarball directory on new site.