Change .del to .delete

[rob4629]

I know this is unlikely to be fixed, but just raising it to provide feedback (or if I get the chance to look in to it).

Each other method is explicit (.post, .get, .put etc), except for delete (.del). I don't know the reason for the shortening of the name, but I think we should be explicit.

For backwards compatibility, we could accept either .del or .delete