set up Windows CI

[pjz]

Given filesystem munging, Appveyor (or some other windows-based CI) would also be useful.

[chadwhitacre]

We have CI at Travis. +1 for Windows (~= Appveyor).

[chadwhitacre]

https://ci.appveyor.com/project/whit537/filesystem-tree-py

@pjz Want to make a PR for AppVeyor config over here based on what we're doing in Aspen?

[pjz]

I could add the config file, but I don't have perms to actually have appVeyor pay attention to this repo. You'll have to do that bit. Which is why I left it as an issue and didn't submit a PR.

[chadwhitacre]

Sorry, I should have been more explicit: I've set up the project at AppVeyor, though the link above is under whit537 and is 404 because I've since reconfigured for gratipay. Here's the new URL:

https://ci.appveyor.com/project/gratipay/filesystem-tree-py

I see a quick fail with Specify a project or solution file. The directory does not contain a project or solution file. That sounds like if you add the config file and push we should see a build.

[pjz]

Fixed with #14