Upgraded Texstudio.app to 2.8.4
support `brew cask --version` per `USAGE.md`

closes #6178
Improve zap feedback messages

In particular, note explicitly when no `zap` stanza is present.
add `--force` option for `brew cask uninstall`

also update some related docs for verbs `install` and `uninstall`
document new suite stanza

* includes other doc nits
* link to `sketchup.rb` will not work until the Casks are also changed
suite stanza, ampps
suite stanza, chemdoodle
comment re: suite stanza, dwarf-fortress
suite stanza, ioquake3
suite stanza, lyrics-master
suite stanza, racket
suite stanza, sketchup
suite stanza, tau
suite stanza, vistrails
Add Amazon Zocalo.app latest
Merge pull request #6206 from rolandwalker/add_version_arg

support `brew cask --version` per `USAGE.md`
Merge pull request #6207 from rolandwalker/improve_zap_messages

Improve zap feedback messages
Update node-webkit to 0.10.5
Merge pull request #6195 from crainiarc/texstudio

Upgraded Texstudio.app to 2.8.4
added mari0