We'll get better failure messages if we use an assertion method that
understands the comparison we're trying to make. If you make the
comparison by hand and assertTrue(), you don't get much constructive
feedback ;).
Do not use abbreviated locale versions of month/whatever, because it seems that
this is not standard (e.g. MacOS abbreviating differently than GNU/Linux).
The old get_relative_path() implementation assumed os.sep == '/',
which doesn't hold on MS Windows. The new implementation uses
split_all() for a more general component count.
I added path_to_url(), because the:
'/'.join(split_all(path))
idiom was showing up in a number of cases, and it's easier to
understand what's going on when that reads:
path_to_url(path)
This will fix a number of places where I think paths and URLs were
conflated, and should improve MS Windows support.
