Upgrade gaze

This commit (https://github.com/shama/gaze/commit/27d3705c1080c9f6e34076eb1ae86bcb37b0f378) fixes the issue with absolute paths and published as `gaze@0.6.1`.

The API change is `watched()` is now async; changing the API here to `watcher.files(function(err, files) {})`.

Also a commit for ensuring the folder `fixtures/stuff` exists before trying to write to it in the tests. All tests should pass now.