Setup appveyor

Here we have an appveyor.yml file that woks with nodejs.
Tests needed to be updated, appveyor is much slower than travis in all way possible.

btw, I ve noticed pouchdb is not compatible nodejs@0.11.
Same here. Actually, something kind of weird happen, it stops before the end.
right after, or during, 
```
    it('starts the main server.', function (done) {
      var opt = {port: 8090};
      actions.start(opt, done);
    });
```

something happen that prevent tests to finish. verbose mode on mocha does not help. IS there verose mode in cozy-light ? I m not clear about logging strategy.