add main site blog rss to planet

[goozbach]

depends on gooseproject/gooseproject.github.com#17

[herlo]

Actually, I think the items in the planet should be the content of the blog posts. We can discuss this further if you disagree.

[shalkie]

Ah, funny. I just merged in the commits pull request and had merged the atom.xml pull request to the main site and thought "Geez, why don't we have the main site blog posts pulled into the planet too... I wonder if goozbach just overlooked it." and was on my way to create the pull request.

In Short: +1 to adding the site posts to the planet.