Create configuration entries for some services:

* Github
* NPM registry

This way, david-dm.org can be run against an internal
NPM registry with packages in private GitHub enterprise
servers
Merge pull request #113 from rafeca/allow-custom-instances

Create more configuration entries to be able to run david-dm.org on custom environments
inc/info.html: fix indentation.
Losslessly compress the recently modified images.
Update dependencies.
Add time-grunt and load-grunt-tasks plugins.