integrate intake data catalog into sphinx site

[rabernat]

We would like to automatically list the datasets on the intake catalog on our new website:
http://pangeo-data.org/data.html

This should be pretty straightforward...we just have to parse the catalog.yaml file.

xref #39

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[martindurant]

Just noticed this because of the stale notification.
Given that Intake already parses such yaml files, generating any list would be easy. What didyou have in mind, @rabernat ?