Document a race condition (I think it is one)

Fixing this may require a larger restructuring. :-/
Adding a comment explaining why we tune the request given to httpLbs

I don't think the code is very descriptive as it is, and I didn't know
a good way to make it so - for now, let's just add a comment.
Removed non-toplevel type signature which was not very useful
Removed some TODO items in favor of GitHub issue tracker

Never used the GitHub issue tracker before, let's give it a try.