bahhh
Merge remote-tracking branch 'public/master' into open-source-contributions
Merge pull request #37 from github/open-source-contributions

Open source contributions
Merge remote-tracking branch 'public/master' into 404-headers-properly
Merge pull request #38 from github/404-headers-properly

404 headers properly
setup headers security team wants everywhere
add moar headers
tests for response headers
none -> 'none'
Merge pull request #39 from github/security-headers

Setup headers security team wants everywhere