mark ADI-developed resources with a gear

Annotate ADI resources with a gear next to the title, and add an explanation of the gear to the top of the page.

![resources adi the application development initiative](https://cloud.githubusercontent.com/assets/2433509/4374634/aac430ca-4335-11e4-9ade-8306e4060931.png)

there are macros in jinja?