Serve insecure badge for david-dm.org @nodesecurity integration
Merge remote-tracking branch 'alanshaw/david-nsp'
Add the ability to output badges as JSON.
GitHub versions: show "none" upon error

Closes #281
GitHub versions: show "none" upon error

Closes #281
Merge branch 'master' of github.com:badges/shields

Conflicts:
	server.js
Avoid risk of crash with URL extension

Part of #283