"Ok" and "ok" was the only available string to use to make http code
200. "OK" should also be available.

Allow us to choose what to test because timeout tests and job management
tests take too much time.

query.exec([{"title": "hello"}, null], {"select_list": "title"});
// before: TypeError: list[i] is null
// after: [{"title": "hello"}]

Job queues are now saved in workspace at different moment

Test if an object is a native object (`var object = {};`) seams not to be a good
idea. The Firefox scratchpad seams to act differently with them.

http://semver.org

davstorage.tests.js is hybrid, you can use it with real server or fake server.