add checksum to PATCH method
add parts to API docs
add missing commas
add created field to upload resource
add more information about the status attribute.
add part keys to Upload patch method

Refs https://github.com/longaccess/longaccess-cli/issues/52
add `archive_uri` attribute to upload resource

Also the `download` attribute in the ADF has changed meaning to be a
URI. It should identify the downloadable archive uniquely but does not
necessarily reveal the actual location of the archive. It should be used
however to discover the actual location of the archive via the API.
update checksum to include md5 and optionally sha512
Merge pull request #6 from kouk/api-update

Missing API features related to uploads.