DSL: add `tags` stanza

only limited/defined keys are permitted
 - :vendor
 - :font_pitch
 - :font_serif
 - :font_weight
 - :font_slant

forward-compatibility: no associated functionality is
provided.  Intentionally left undocumented.

References: #4688
updates for Karabiner

- `:launchctl` no longer needed
- `binary` artifacts added
- change stanza order
Update VisualVM.
MacUpdate Desktop 6.0.1
Merge pull request #5288 from ahbeng/macupdate-desktop-6.0.1

MacUpdate Desktop 6.0.1
Merge pull request #5287 from nightscape/update_visualvm

Update VisualVM.
Merge pull request #5286 from rolandwalker/karabiner_updates

updates for Karabiner
Update Soulseek to 2014.6.15
Merge pull request #5281 from federicobond/soulseek

Update Soulseek to 2014.6.15
adding a cask for the open source bible study app, eloquent
update slack to official download URL

URL was retrieved by asking via their support channel, so it should
remain good for awhile

also update appcast based on new url found in latest download
Merge pull request #5293 from kai5263499/eloquent

New cask for Eloquent application
Merge pull request #5292 from caskroom/update-slack

update slack to official download URL
sourcetree: Update to 1.9.5.1
Merge pull request #5294 from simono/sourcetree-1.9.5.1

sourcetree: Update to 1.9.5.1
rstudio 0.98.953
Fix Simple Comic sha.
Merge pull request #5298 from hswong3i/simple-comic-1.7_252

Fix Simple Comic sha.
Merge pull request #5295 from sjackman/rstudio

rstudio 0.98.953
Update ghc to r8