Add base36 URL path converter

[Tilman Koschnick]

This adds base36 to the list of default URL path converters, based on django.utils.http.base36_to_int. It allows shorter URLs for integer values that are easier to type (easier to keep one's place than in a longer string of only numbers).

[Tilman Koschnick]

​PR

[Nick Pope]

I'm not sure why this needs to be defined in Django itself. The ​default set of path converters doesn't even contain base64 which would seem to be more useful than base36 to me. Creating ​custom path converters is trivial, so I'm not sure that we need to expand the default set. If you disagree, please feel free to raise this on the DevelopersMailingList.

[Tilman Koschnick]

Hi, is lack of complexity reason not to add something? The other converters are trivial as well, after all.
Just for the record: base64 is less suitable for my use case; while it is somewhat shorter than base36, it adds capital letters, "=" and (in the url safe variant) "-" and "_" into the mix, so doesn't fulfil my "easier to type" criterion.

[Mariusz Felisiak]

Hi, is lack of complexity reason not to add something?

No, it's not. We cannot add hundreds of features just because they are not complex ("death by a thousand cuts").

[Tilman Koschnick]

Okay, understood, thanks for clarifying!