* Add a proper Kotlin constructor for Request
This turns out to be very useful throughout our test suite.
* Dump updated API
* Fix multipleTags Kotlin conversion
This is a source-incompatible API change. In particular, Response.body(null)
is no longer source-compatible for Kotlin source.
The upside is tremendous: no need for callers to use !! on Response.body
on every single API call. In the rare cases where a Response doesn't have
a body we use a runtime error. This is unlikely to cause problems in
practice; users don't have reason to read the response body on supporting
responses.
