Move .hg & .bzr above .git root files

projectile does a search by file type, so it first goes up the
tree looking for projectile, then up the tree for .hg then up
the tree for .git. Since I generally have my ~/ as a git repository
.git should be last so that I can have projects that aren't git
repos.

Maybe open a PR to have this changed, or customizable.

Switching everything to the other way might also work, but I don't
think so.