Add tests with additional clean up

[pwoodworth]

This is a cleaner attempt at the closed https://github.com/turn/ttorrent/pull/58 in a new pull request to avoid losing more comment history.

This includes the tests from #46, cleaned up to minimize unnecessary changes to existing code, and reformat the test code to match existing project code style.

[pwoodworth]

Sorry for the thrash with a new pull request, but I was dismayed to lose your comments on the code in the last pull request even though I believe I addressed them all. Anyway I won't touch this branch again until you've commented (or just closed) this pull request. Thanks for taking the time to review it.

[mpetazzoni]

Are you sure that second commit (the merge commit) is supposed to be there? It seems like it contains a lot of things I already have merged into master. Shouldn't you have rebased Sergey's work on top of master before proposing this pull request?

[pwoodworth]

@mpetazzoni Yes the merge out from master is correct, in that when this branch gets merged to master it will only result in the changes seen in this pull request. It would of course be slightly cleaner to rebase Sergey's work but then they would show up as my changes rather than Sergey's and again I'm not comfortable expunging him from the history. To get a cleaner history at this point would require Sergey to post a branch rebased on master and incorporating my cleanup which I'm fine with, but isn't under my control.

[pwoodworth]

Okay, I think I might've figured out how to get a better history, without losing Sergey's credit and without merging in/out from master on the PR branch. To do so, I'll be posting yet another new pull request and closing this one (rather than force pushing and losing comment history again).