Use a YAML file listing the projects to generate the specs.openstack.org
root page and an OPML file for all of the available RSS feeds.
These changes are based on the work of Maish Saidel-Keesing
<maishsk@gmail.com> in https://review.openstack.org/#/c/140041/
Change-Id: I828d65f10fb7608b59e3561cedc9553d4d96ee75