Bump to 1.13 and update documentation accordingly
When giving a package, allow the user to specify more branches than the package has

This way in pkgdb-cli we can use all the active branches w/o having to
check what are the branches for each package.
Adjust the unit-tests for the new behavior of the /package/acl/reassign/ endpoint
Release 1.13.1 and adjust documentation accordingly
Fix api for orphan/unorphan/retire and reassign as set are not serializable to JSON
Release to 1.13.2 and adjust documentation accordingly