Allow (pre)deploy scripts to take arguments from the command line.

It's annoying to have to type the controller ID every time, but so
is having to fish the appengine-web.xml to set the controller there.
With this, you can just hit the up arrow key to redeploy your dev
version.
Mark suspicious comment.

I think it's wrong, but it has nothing to do with this branch and
I don't want to either spend time with this, shoot from the hip,
or leave it there just like that to confuse further readers.
Merge branch 'fallback-balancing' of github.com:getlantern/lantern-controller into fallback-balancing