Code review comment for lp:~mterry/unity8/statsWelcomeScreen

OK, updated this branch to prevent overlapping animations. Except for the no-data -> data transition, where libusermetrics itself forces us to show immediately, since it signals itself that we're ready for the show animation (usually libusermetrics leaves that to us, but not in this case). So while that transition is abrupt, the data -> no-data looks good and neither shows overlapping animations like it used to.