Integrate UAK into LTP

Following the discussion in https://lists.launchpad.net/ltp-devs/msg00004.html and having heard no objections up until now, I think it'd be great for us to enable this in the LTP some time soon:

At vUDS we had a discussion in the UAK session (http://summit.ubuntu.com/uds-1303/meeting/21642/community-1303-uak-next-steps/) about where best to put the UAK contents online.

We were envisioning an infrastructure similar to developer.ubuntu.com and developer.ubuntu.com/packaging - where on the machine itself we run a script which gets the ubuntu-packaging-guide package from a ppa and puts the HTML bits online.

The way this might work:

 - implement a management command which downloads a package
   from a PPA, extract it and copy its content into the right
   place (this is what we use for deploying the packaging
   guide: lp:~dholbach/+junk/update-packaging-guide)
 - the above will probably need some changes from IS
   like 1) poke holes into the firewall, 2) serve some
   loco.ubuntu.com files through normal apache
 - link to it from standard places in the LTP