Adding a template tag to generate query strings

[carltongibson]

This comment from @bmispelon corresponds to my view:

@bmispelon

I don’t have a super strong opinion about it but I’m not in favor of having to quote keys. I feel that it makes the “normal” use-case more complicated for the benefit of a rare one.

…

To me, this could be fixed instead by adding support for *args and **kwargs syntax in the template language, but I realize that’s quite a big undertaking (though it would also solve similar issues with the {% cycle %} tag.

I think both having to quote literal keys would be a pain, and that some kind of **kwarg expansion would be a generally useful technique for us to pick up.

(No opinion on the possible name change. )