Amend valid values for tags stanza

- remove font tags (per earlier discussion - they were left
  in by mistake)
- add tag `:name` for corner cases where the Cask name cannot
  adequately follow the product name.  Examples: non-English
  apps, App bundles which do not match publicized names.
Merge pull request #5540 from rolandwalker/amend_tags

Amend valid values for tags stanza