Pushed zeitgeist branch

[Federico Mena Quintero <federico gnome org>]

Hi, everyone,

Seeing that the patches to add Zeitgeist-based searching from bgo#640659
were pretty much settled down, I fixed the last nits and pushed a
"zeitgeist" branch to git.gnome.org.

I'll take care of merging master into that branch periodically, to keep
things in sync.

After this, I'll use that branch to add the journal code as a "Recent
Activities" tab in the overview.  Unfortunately those commits are still
quite unpolished, so I don't feel comfortable pushing them out just yet.

So, this is just a heads-up.  Feel free to check out the "zeitgeist"
branch, and have fun :)

  Federico