[WIP] Add organization metadata

## Do not merge
Sample of moving organizations from _config.yml to a separate markdown format

![org metadata on prose](https://f.cloud.github.com/assets/1297909/1387533/6beebae2-3b9c-11e3-8944-c06cb02ac3c8.PNG)

This would allow people to write a brief description of the organization and provide the required metadata to categorize them on the Community page.

Related to gh-75