Move container javascript to features directory and use shindig namespace

SHINDIG-1292

[Paul Lindner, 2010-02-16 12:03:24]

here's the changes to move container js into the features directory.  More work
to be done, but I'd like to see some feedback on this approach.  I suspect we'll
want to further split the features (no reason for all containers to get cookie
based userprefs store for example..)

I hope this also compels us to finally rewrite gadgets.js aka
shindig.container.*

Thanks