* Add appyveyor config
This commit does add settings for using mssql on appveyor
but there are still some issues with timeouts. For now only
the sqlite build is enabled.
Note that the build currently (correctly) fails on windows
* Fix unittests on Windows (in wagtaildocs)
The document.file.name attribute doesn't contain a valid path separator
on windows. Use document.file.path for comparison instead.
