The delegate logic is implemented and seems sound.
It's somewhat funny that after all this back and forth, all we get
is a valid start position for the upload.
Make it cristal clear what the crate version means, and what version of
the documentation you are looking at. Also do this in the README file.
Assure that 'Google' is capitalized.
That way, crate names reveal exact inforamtion about the contained
API revision.
* crate version: code gen version
* +<revision> (build-metadata): exact version of API schema
Fixes#38
