Copyright dates are out-dated. Should we put all documentation under the Creative Commons Attribution-only license? Here's a modified version of the text that I typically include regarding licensing of my presentations, class materials, etc:

```
This work is licensed under the Creative Commons Attribution 3.0 United States License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/us/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.

Feel free to use or modify the PICRUSt documentation, but please credit PICRUST by placing the following attribution information where you feel that it makes sense: The PICRUSt Project, http://picrust.github.com.
```