Repo/Travis: Testing adjustments, since some links for preinstall died.

make-doc (was a suggestive add).
git-core (awaiting new linking).
Err http://ppa.launchpad.net/pdoes/ppa/ubuntu/ precise/main git-core all 2:1.8.5.2-0avh1~precise
404 Not Found
E: Unable to fetch some archives

Signed-off-by: Bootz <bootz@projectskyfire.org>