add test that exercises tar container

refs #1083
Move Google Chrome variants to caskroom/homebrew-versions
Move tunnelblick to homebrew-versions
new preferred sourceforge url style

 - document sf link policy
 - change audit to accept old and new style links
 - need to keep old style links for projects where the 'latest' link
   does not point to something usable
 - link to official policy in audit warning message

refs #1436
Merge pull request #1501 from phinze/1083-test-tarballs

add test that exercises tar container
reference contributors in license

<3 foss
Merge pull request #1504 from phinze/1436-latest-sourceforge-links

new preferred sourceforge url style
Gawker latest

closes #1436

Signed-off-by: phinze <paul.t.hinze@gmail.com>
1Password 4.0.7
Moving RStudio Preview to homebrew-versions
Merge pull request #1508 from jglenes/rstudio-preview

Moving RStudio Preview to homebrew-versions
GoAgentX v1.3.33
Merge pull request #1509 from exherb/go-agent-x-v1.3.33

GoAgentX v1.3.33